Structural Anchor Supply supplies engineering-based foundation products covering applications such as earth retention, underpinning, pipe support, and more.
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geotechref
A Wiki-based collection of geotechnical engineering information, tutorials, resources, and downloads. Visit geotechref
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RisiStone Systems
Creators of several nice modular block retaining wall systems. Their website has free design software for their products. Visit RisiStone Systems
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Eng-Tips Forums
Popular engineering forum site, including a very active section for “Soil/Groundwater environmental engineering”. Visit Eng-Tips Forums