Knechtel, M. M. 1. (1956). Bentonite deposits in marine cretaceous formations, Hardin District, Montana and Wyoming: With a section on laboratory procedures used for testing the bentonites. Washington: United States Government Printing Office.
Styl ChicagoKnechtel, Maxwell M. 1897-. Bentonite Deposits in Marine Cretaceous Formations, Hardin District, Montana and Wyoming: With a Section On Laboratory Procedures Used for Testing the Bentonites. Washington: United States Government Printing Office, 1956.
Citace podle MLAKnechtel, Maxwell M. 1897-. Bentonite Deposits in Marine Cretaceous Formations, Hardin District, Montana and Wyoming: With a Section On Laboratory Procedures Used for Testing the Bentonites. Washington: United States Government Printing Office, 1956.