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21
Porter, Roy, 331-P847s | Cambridge University Press | 1994 331-P847s,
22
Brewer, John, 320.9-B847c | Routledge | 1994 320.9-B847c,
23
Pierce, Roy, 344.9-P617c | University of Michigan Press | 1995 344.9-P617c,
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25
Prentice, Roy, 601.5-P927t | Cassell | 1995 601.5-P927t,
26
Phillips, Charles L, 559.9-P558f | Prentice Hall | 1991 559.9-P558f,
27
Pearce, Roy Harvey, 841-P359w | Prentice-Hall | 1962 841-P359w,
28
Bergman, J, 438.9-B499h | The royal society of chemistry | 1991 438.9-B499h,
29
Royce, Joseph R, 182.1-R888t | Prentice-Hall | 1983 182.1-R888t,
30
Porter, Roy, 740-P844g | Routledge | 1991 740-P844g,