Creators of several nice modular block retaining wall systems. Their website has free design software for their products.
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Geotehnic Student
A group for geotechnical students in Iran Visit Geotehnic Student
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Google Earth Blog
Great blog on all things related to Google Earth. Visit Google Earth Blog
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Akkerman Inc.
Manufacturer of microtunneling, pipejacking, tunneling, guided boring and earth pressure balance equipment for tunnels up to 14-ft in diameter. Visit Akkerman Inc.