Marr, W. A. (2003). A history of progress: Selected US papers in Geotechnical Engineering. American Society of Civil Engineers.
Chicago-referens (17:e uppl.)Marr, W. Allen. A History of Progress: Selected US Papers in Geotechnical Engineering. American Society of Civil Engineers, 2003.
MLA-referens (9:e uppl.)Marr, W. Allen. A History of Progress: Selected US Papers in Geotechnical Engineering. American Society of Civil Engineers, 2003.
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