3 books
Building the Clarkson Company, Making Reagent Feeders and Valves for the Mineral Industry, 1935 to 1998 (Classic Reprint)
Building the Clarkson Company, Making Reagent Feeders and Valves for the Mineral Industry, 1935-1998
Building the Clarkson Company, Making Reagent Feeders and Valves for the Mineral Industry, 1935-1998; Oral History Transcript - 1999