TY  - BOOK
AU  - Whitney,Milton
ED  - United States.
TI  - Field operations of the Bureau of Soils, 1917: (nineteenth report)
U1  - 631.4 .U581 1923 
PY  - 1923///
CY  - Washington
PB  - Government printing office
KW  - Suelos
KW  - z-- Estados Unidos
N1  - Sello: ´United States Department of Agriculturé (portada), ´Tecnológico de Monterrey. Patrimonio Cultural´ (portada)
ER  -