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The rainmakers : American "pluviculture" to World War II
Clark C. Spence
Bok Engelsk 1980
Mining engineers and the American West : the lace-boot brigade, 1849-1933
Clark C. Spence
Bok Engelsk 1970
The American west : a source book
edited by Clark C. Spence
Bok Engelsk 1966
The sinews of American capitalism : an economic history
Spence, Clark C.
Bok Engelsk 1965