Breymeyer, A. I. Grasslands, systems analysis and man - London : Cambridge University, 1980 - 950 p. : ilus. ; gráfs. - International Biological Programme ; 19 . - International Biological Programme ; 19 . LCCN: 24107 Subjects--Topical Terms: Pastizales--Ecología.Pastos. Dewey Class. No.: 633.2 / B75