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by Allen, Colin; Hand, Michael
by Allen, Colin; Bekoff, Marc
by Bekoff, Marc; Allen, Colin; Burghardt, Gordon M.
by Wallach, Wendell; Allen, Colin
by Manchester, Colin; Poppleston, Susanna; Allen, Jeremy
by Harbinson, William Allen; Wilson, Colin; Webb, Adam
by Allen, Colin; Lauder, George V.; Bekoff, Marc
by Allen, John; Endeacott, Colin Graham