Perspectives in grassland ecology : results and applications of the US/IBP Grassland Biome study - French, Norman R. (New York : Springer-Verlag, 1979)
Keywords: Grassland ecology -- North America; Range management -- North America; arot; ekologia; laitumet; stäpper; ekologi; betesmarker; Pohjois-Amerikka.; Nordamerika; ruohomaat