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11
Sanders, Arthur, 331.15-S215m | Iowa State University Press | 1990 331.15-S215m,
12
Slade, Joseph W, 801-S631b | Iowa State University Press | 1990 801-S631b,
13
Littlewood, Thomas B, 070.4-L781a | Iowa State University press | 1990 070.4-L781a,