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1
Roth, Charles H., 569.3-R845f | Brooks/Cole | 2004 569.3-R845f,
2
Roth, Charles H, 569.92-R845d | Duxbury Press | 1998 569.92-R845d,
3
Roth, Charles H., 566.36-R845f | McGraw-Hill | 1985 566.36-R845f,
4
Clotfelter, Charles T, 323.9-C646s | University of Chicago Press | 1993 323.9-C646s,