Peck, T. R. Soil testing, correlating and interpreting the analytical results : proceedings of a symposium... - Madison, Wis. : American Society of Agronomy, 1977 - 117 p. : gráfs. - Special publication ; 29 . - Special publication ; 29 . LCCN: 38291 Subjects--Topical Terms: Muestreo de suelos.Suelos--Análisis. Dewey Class. No.: 631.42 / P4