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- J S Group
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- Jean Lutz SA
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- Journal of Petroleum Geology
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- LimitState Ltd
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- University of Liverpool
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- University College London
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- University of London: Royal Holloway
- Loots Groundwater International
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- Low & Bonar
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- M J Rees
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- The University of Manchester
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- Mannvit
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- Marshall Drilling Ltd
- William J Marshall & Partners
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- Mason Evans
- Matchtech Group (UK) Ltd
- Materials Movement Ltd
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- Mattinson Partnership
- Maxwell GeoSystems Ltd
- MB Stratigraphy Limited
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- MCD Ground Solutions
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- Meehan Drilling Ltd
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- Merrett Survey Ltd
- Met Consultancy Group
- Meteorological Office
- Metrol Technology Ltd
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- Michelmores LLP
- Micon International Co Limited
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- Millard Consulting
- Millennia SC Ltd
- Mincon Carbide Ltd
- Mineral Planning Group
- Mineral Products Association
- The Mineralogical Society
- Minerex Environmental Limited
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- Mining Analyst Consulting Ltd
- Mining Journal
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- Minton Treharne & Davies Ltd
- M&J Drilling Services Ltd
- MJCA
- MM-EC Geoenvironmental
- Mott MacDonald
- Moussa Direct Ltd (Moussa Minerals & Fossils)
- The MSA Group
- MT Geoservices Ltd
- Murphy Geospatial
- Namurian Geological Services Limited
- National Association of Mining History Organisations
- National Collection of Aerial Photography (NCAP)
- National Map Centre
- National Museum Wales
- National Sewerage Association (NSA)
- National Stone Centre
- Natural England
- Natural Environment Research Council
- The Natural History Museum
- Natural Power
- Naue Geosynthetics
- Naylor Darinage
- Neil Foundations Systems Ltd
- Neilsoft Private Limited
- Network Stratigraphic Consulting Ltd
- New Pig Ltd
- University of Newcastle
- NewFields UK LLC
- Newman Drilling
- Nicholas O'Dwyer
- Nicholls Boreholes & Ground Source
- Nordmeyer GEOTOOL GmbH
- North of England Institute of Mining and Mechanical Engineers
- North Ridge Pumps Ltd
- Northern Geological Supplies Limited
- University of Nottingham
- NUB Engineering Ltd
- Nubian Consulting Ltd
- NX Consulting
- Oasys Ltd
- Obsidian Environmental
- O'Callaghan Moran & Associates
- Odour and Dust Solutions Ltd
- OEMA
- OGI Groundwater Specialists Limited
- Ohmex Ltd
- Oilfield Production Consultants (OPC) Ltd
- Omega Laser Services
- Omnia
- One Stop Testing Equipment
- OnSite Central Ltd
- Oolithica Geoscience Ltd
- The Open University
- Oracle Environmental Experts Limited
- OSM Environmental Consultants Ltd
- Osprey sUAS
- OT Drilling Ltd
- The University of Oxford
- P J Edwards & Co (UK) Ltd
- P J Hirons Ltd
- Padley & Venables Ltd
- PAGeotechnical Ltd
- Pangaea Integrated Reservoir Solutions Limited
- Paragon Drones Ltd
- Partrac Ltd
- PB Drilling Ltd
- PCE Instruments UK Ltd
- Penguin Recruitment Ltd
- Pennine Geotechnical Services Ltd
- Perega
- Petrolab Limited
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- Phase Site Investigations Ltd
- Phlorum Limited
- Piledesigns Limited
- PJ Piling Contracts
- Platipus Anchors Limited
- Plowman Craven Ltd
- University of Plymouth
- Pore Scale Solutions Limited
- University of Portsmouth
- Powys Drilling Services Ltd
- Premier Corex
- Premier Energy Services Ltd
- Premier Plant Eng Ltd
- Priority Drilling Ltd
- Priority Geotechnical Ltd (PGL)
- Prodar Surveys
- ProDrive Ireland Ltd
- PROKON Software Ltd
- Proquip Direct Limited
- PRP UK Limited
- PSA Design Ltd
- PSD (Pigott Shaft Drilling) Ltd
- PSL Professional Soils Laboratory
- QED Environmental Systems Ltd
- QME Limited
- QROS Limited
- Quantum Geotechnic Ltd
- R I Geotechnics Ltd
- RAES Energy Ltd
- Ramboll
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- University of Reading
- Red Rock Geoscience Ltd
- Redroc AB
- RedRock Associates Limited
- Redstart Northwest Limited
- REGENESIS Europe
- Reid Geophysics
- Reinforced Earth Company Ltd
- Remada Ltd
- Remediation Strategies Ltd
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- Remote Aerial Surveys
- Rendel Ltd
- Resource UK
- Reynolds Geo-Solutions Ltd
- RGS - Rogers Geotechnical Services
- Richard Booth's Bookshops
- Richard Tayler Minerals
- Ridge and Partners LLP
- Rieker Inc.
- Riley Geoscience Ltd
- Risk Management Limited
- RM Frobisher (1986) Ltd
- RMA Environmental Limited
- RMS UXO Ltd
- Roberts Environmental Ltd
- Robertson Geo
- ROC Consulting
- Rock Options Ltd
- Rockbit UK Ltd
- Rockfield Software Ltd
- Rockflow Resources Ltd
- Rockmate Limited
- Rocktype Ltd
- RockWare, Inc.
- Rocscience Inc
- Roctest Ltd
- Roger Bullivant Limited (RB)
- Rolton Group
- Roskill Information Services
- Rotary Test Drilling Ltd
- The Royal Academy of Engineering
- Royal Astronomical Society
- Royal Eijkelkamp
- Royal Forestry Society
- Royal Geographical Society with IBG
- Royal HaskoningDHV
- Royal Highland and Agricultural Society of Scotland
- Royal Institute of British Architects
- Royal Institution of Chartered Surveyors
- Royal Meteorological Society
- Royal Scottish Geographical Society
- Royal Society of Edinburgh
- Royal Society of Biology
- RPA Safety Services Ltd
- RS Hydro Ltd
- RSA Geotechnics Ltd
- RSC Mining and Mineral Exploration
- RSK Geosciences
- Ruddlesden Geotechnical
- Rukhydro Limited
- Russell Geotechnical Innovations Limited
- S M Foster Associates Limited
- Salop Sand & Gravel Supply Co Ltd
- Sandberg LLP
- SatSense Limited
- Saxton Drilling Limited
- Scantech Geoscience
- SCGIS Ltd
- Scott Polar Research Institute
- Scottish Wildlife Trust
- Scout Recruitment
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- SDP Consulting Engineers
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- Senceive Ltd
- Sensys GmbH
- Sequoia Environmental Ltd
- Sercel
- SERPRO
- Sevenoaks Environmental Consultancy
- SG Access Solutions Ltd
- Shadbolt Group
- ShadowAir Ltd
- University of Sheffield
- Shell UK Exploration & Production
- Shire
- Shotcrete Services
- Sidcup Lapidary & Mineral Society
- Sigicom UK
- Silkstone Environmental Limited
- Simpson Associates Consulting Engineers LLP
- Site Analytical Group
- Site Vision Surveys
- Sixense Limited
- SJ Geomatics Ltd
- Skelair International Ltd
- SkyTec UAS Ireland Ltd
- SLR Consulting Ltd
- Sir Frederick Snow & Partners Ltd
- Society for Underwater Technology
- SOCOTEC UK Limited
- Soil Consultants Ltd
- Soil Engineering Geoservices Ltd
- Soil Instruments Limited
- Soil Property Testing Ltd
- Soilmec Ltd
- Soils Limited
- Soiltec Laboratories Ltd
- Solmek Ltd
- Somerset Archaeological and Natural History Society
- Sonic Drilling Supplies Ltd
- University of South Wales
- Southern Testing Ltd
- Specialised Geological Mapping Ltd
- Specialist Ground Engineering Ltd (SGE)
- SRK Consulting
- University of St Andrews
- Staffordshire Wildlife Trust
- Stag Geological Services Ltd
- Stanfords
- Stantec
- STM Environmental Consultants Ltd
- Story Geotechnical Engineering
- StrataData Ltd
- Stratasolve Ltd
- Stratum Drilling Solutions
- Stratum Reservoir
- Structural Soils Ltd
- Struers Ltd
- Stuart Well Services
- Sub Surface Ltd
- Subscan UDS Ltd
- Subsea 7
- Subtechnics Limited
- Sumo Geophysics Ltd
- Survey & Engineering Projects Limited
- The Survey Association
- Survey Three Limited
- Sutcliffe
- Svenska Petroleum Exploration UK Ltd
- Sweco
- Swiftdale Geological Consultants
- Symmons Madge Associates Ltd
- Syntillica Ltd
- TAL Construction
- Tam International North Sea Ltd
- Target Exploration Consultants Ltd
- Tarmac, a CRH Company
- Tate Exploration Consultants Ltd
- Tatra Rotalac Ltd
- Taylor & Francis Group Ltd
- Taylor Drilling Services Ltd
- TD Construction Testing Ltd
- Team UAV
- TEC
- Technics Group
- Teckna Group Ltd
- TECOP, S.A.
- Tectosat Ltd
- Telluric Land Remediation Ltd
- TenCate Geosynthetics (UK) Ltd
- Tensar International Limited
- TerraDat (UK) Ltd
- Terram (Berry Global, Inc)
- Terraroc UK
- TerraVisio Geosolutions (UK) Limited
- TestWells
- Texo DSI Limited
- The QMJ Group Limited
- Thermac Hire Ltd
- thinkWhere
- Thomas Armstrong Group
- Thomas Telford Ltd
- Thompsons of Prudhoe Ltd
- Thomson Environmental Consultants
- Tigergeo Limited
- Titan Environmental Surveys Ltd.
- Tobin Consulting Engineers
- Tom Briody & Son
- Tony Gee and Partners LLP
- Topcon Positioning (Great Britain) Ltd
- Topdrill Ltd
- Toureen Group
- Town and Country Planning Association
- T&P Regeneration Ltd
- TPA
- Trendrevel Services Ltd
- Trident Hydraulics Ltd
- TRL Limited
- Troika International
- T.T. Precision Engineering
- TT Surveys Ltd (TTS)
- Tullow Oil plc
- Turnkey Instruments Ltd
- Turnkey Regeneration
- Twickenham Surveys
- Ubique Ground Engineering Limited
- University College Cork
- University of Southampton, Ocean & Earth Science
- Urban Regen Limited
- US Radar Inc
- Utsi Electronics Ltd
- Van Elle Ltd
- Van Walt
- Vandenbelt Consulting
- Verde Environmental Group
- VertaseFLI Limited
- Vertical Access Ltd
- Viridien
- Visual Technology Services Ltd
- VJ Tech Ltd
- VolkerGround Engineering Ltd
- Wall's Well Drilling
- Ward Cole Consulting Engineers
- Wardell Armstrong LLP
- Wardrop Minerals Management Ltd
- Water Resource Associates LLP
- Well Drilling UK Ltd
- Wesson Environmental
- University of The West of Scotland
- Westpointe Ltd
- Westwood Global Energy Group
- Wheal Jane Laboratory
- Wheeler Site Investigation
- Whiteford Geoservices
- Whittles Publishing Limited
- Wilde Analysis Ltd
- Wiley
- Wilson Associates
- Wiltshire Geology Group
- Wincilate Ltd
- Wiser Environment
- WJ UK
- WML Consulting
- Wood
- Working Smart Ltd
- Worms Eye Limited
- Wrekin Products Ltd
- Writtle College
- WSP/Parsons Brickerhoff
- X-ray Mineral Services Ltd
- YES - Your Environmental Solutions
- ZDS Pump Innovation
- Zenith Global Ltd
- Zetica