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21
Eckert, Roger, 491.1-E19a | W H Freeman and Company | 1983 491.1-E19a,
22
Rogers, David E, 334.2-R725a | Westview Press | 1992 334.2-R725a,
23
Rogers, David L, 350.2-R725i | Iowa State University Press | 1982 350.2-R725i,