00394nam a2200157Ia 4500008004100000020001500041082001800056100001800074245002500092260004400117300000800161650001800169650002400187653001300211653001200224170901s1981    xx            000 0 und d  a0195027612  a599.051bF12A  aFagen, Robert 0aAnimal Play Behavior  aNew YorkbOxford University Pressc1981  a684  aPure Sciences  aZoological sciences  aBehavior  aMammals