Muller-Schwarze, Dietland, Ed. <br/><br/>
Evolution of play behaviour 

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 - Dowden, Hutchinson & Ross, Inc., Stroudsburg  1977 
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 - Benchmark Papers in animal behavior-10 .
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<br/><br/><label>ISBN: </label>  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Animal behaviour patterns
<br/><br/><label>Dewey Class. No.: </label>591.5  MUL-E