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1
Brummett, Palmira, 909-B893c | Longman | 2003 909-B893c,
2
Roberts , Edgar V., 802-R643l | Prentice Hall | 2001 802-R643l,
3
Roberts, Edgar V, 802-R643w | Prentice Hall | 1995 802-R643w,
4
Roberts, Edgar V., 802-R643w | Prentice-Hall | 1981 802-R643w,
5
Roberts, Edgar V., 802-R643w | Prentice-Hill | 1977 802-R643w,