Western US contractor based in CA specializing in construction segmental retaining walls for 20 years.
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Sireg
Manufacturer of synthetic products for tunneling and foundations: sleeved pipes for grouting, glass fiber bars for anchors, bolts, temporary and permanent reinforcements, drainage pipes, inclo-casings, waterstop. Visit Sireg
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Geology.com
A great source for geology news and they also have a number of interesting and useful resources and maps. Visit Geology.com
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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.