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11
Watson, James D, 476.1-W339r | Scientific American Books | 1983 476.1-W339r,
12
Walrond-Skinner, Sue, 332.1-W221e | Routledge & Kegan Paul | 1987 332.1-W221e,
13
Watson, David, 338-W338c | Routledge Kegan Paul | 1980 338-W338c,