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21
Poin Ltd, 539.7-P662e-P
| Pion Ltd. |
1988
539.7-P662e-P,
22
Mathews, Jon, 414-M429m
| Benjamin Cummings Publishing Company |
1983
414-M429m,
23
Mathewson, Rufus W, 892.8-M429p
| Stanford University Press |
1975
892.8-M429p,