Bear, Firman E. Chemistry of the soil - 2 ed. - New York : reinhold, 1964 - 515 p. : ilus. - Monograph series ; 160 . - Monograph series ; 160 . LCCN: 13417 Subjects--Topical Terms: Suelos--Análisis.Suelos--Química de. Dewey Class. No.: 631.41 / B43 1964