00337nam a2200133Ia 4500008004100000082001800041100001700059245002900076260003900105300000800144650001400152650002000166653001700186170901s1930    xx            000 0 und d  a372.357bW99T  aWyss, C. Von 0aTeaching of Nature Study  aLondonbA. and C. Black Ltd.c1930  a101  aEducation  aSocial sciences  aNature study