@misc{Smoleński_Jerzy_(1881–1940)_Ziemia_1931], author={Smoleński, Jerzy (1881–1940)}, copyright={Public Domain}, address={[Warszawa}, howpublished={online}, year={1931]}, publisher={"Kultura i Wiedza"}, language={pol}, title={Ziemia jako podłoże dziejów ludzkości}, URL={http://www.rcin.org.pl/Content/31230/PDF/WA308_2417_B7164_ZIEMIA-JAKO-PODLOZE_I.pdf}, keywords={history of man, man and the environment, natural environment, climate and man, ecology, environment and settlement, migration of population, demography, history of civilizations, history of culture}, }