China and America against Soil Erosion: II. Losses and Gains

Autor:	Lowdermilk, W. C., Wickes, D. R.
Zdroj:	The Scientific Monthly, 1943 Jun 01. 56(6), 505-520.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/17871 Zobrazit plný text záznamu