00377nam a2200109Ia 4500008004100000020001800041082000800059245008200067260002900149260000900178856008000187181017s9999    xx            000 0 und d  a9780309572255  a622 0aStability, Failure, and Measurements of Boreholes and Other Circular Openings  bNational Academies Press  c1993  uttps://ebookcentral.proquest.com/lib/hec-ebooks/detail.action?docID=3377536