Gerd S. On the Way to Nature. A collection of topics for the observation of animals and plants. Issue 2. Methodological development of topics for school circle leaders In Russian (ask us if in doubt)./Gerd S. Na puti k prirode. Sbornik tem dlya nablyudeniya zhivotnykh i rasteniy. Vypusk 2. Metodicheskaya prorabotka tem dlya rukovoditeley shkol'nykh kruzhkov Sower 1926. 112 p. SKUalbb9f258f47aa049f5.