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11
Hartmann, William K, 443.2-H333m | Wadsworth Publishing Company | 1999 443.2-H333m,
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Hartmann, R R K., 701-H333d | Applied Science Publishers | 1981 701-H333d,
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Hartmann, Frederick H., 349-H325r | Dellen Publishing | 1978 349-H325r,