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200 1 $aGeotechnology$ean introductory text for students and engineers$fA. Roberts
210   $aU.K.$cPergamon Press$d1977
215   $aXVII. 347 p.$cill.$d26 cm
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200 10$aReports and maps of the Geological Survey released only in the open files, 1967$b[electronic resource] /$fby Betsy A. Weld, Margaret S. Griffin, and George W. Brett
210  1$aWashington :$cU.S. Dept. of the Interior, Geological Survey,$d1968.
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