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1
Humphrey, Watts S., 005.12-H926m | Addison-Wesley | 1997 005.12-H926m,
2
Woods, Robert H., 591.953-W896m | Educational Institute of the American Hotel & Motel Assoication | 1997 591.953-W896m,
3
Kappa, Margaret M., 591.9525-K17m | Educational Institute of the American Hotel & Motel Association | 1997 591.9525-K17m,
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Education Publishing Company Ltd. [, ]