@book{ Solr-MUB01006448467, title = {Bentonite deposits in marine cretaceous formations, Hardin District, Montana and Wyoming : with a section on laboratory procedures used for testing the bentonites}, series = {Geological Survey Bulletin ;}, author = {Knechtel, Maxwell M. 1897-}, address = {Washington}, publisher = {United States Government Printing Office}, year = {1956}, pages = {4}, }