Specifications 1940-76 (with omissions). 1976. Air compressors for ice-prevention air systems at Angostura, Cascade, Anderson Ranch, and Enders Dams and Granby pumping plant, Angostura unit, S. Dak., Missouri Basin project, Boise project, Idaho, Frenchman-Cambridge unit, Nebr., Missouri Basin project, Colorado-Big Thompson project, Colo.