P. K. Sims

Information Circular 1. Directory of Minnesota Mineral Producers 1962

P. K. Sims, 1964 .

RI-42 Industrial Minerals-Today and Tomorrow: the Raw Materials to Build the Upper Midwestworkshop Proceedings

P. K. Sims, Gary B. Sidder, 1993 .

Industrial minerals, today and tomorrow; the raw materials to build the upper Midwest

P. K. Sims, Sarah Chadima, R. F. Biek, 1992 .

A Broader View

Marion E. Bickford, P. K. Sims, Paul Karl Link, 1993 .