[047-21]Clay Mineralogy of Lower Tertiary Continental Deposits of the San Juan Basin, Colorado
Droste, John B. Clay Mineralogy of Lower Tertiary Continental Deposits of the San Juan Basin, Colorado 047-21-print
[050-30]Clay Mineral Composition of Calcareous Till in Northwestern Pennsylvania
Droste, John B and Doehler, Robert W. Clay Mineral Composition of Calcareous Till in Northwestern Pennsylvania 050-30-print