TY  - BOOK
AU  - Hilgard, Eugene Waldemar.
TI  - Soils ; their formation, properties, composition and relations to climate and plant growth in the humid and arid regions
U1  - 631.4 
PY  - 1930/// (c.1906)
CY  - New York
PB  - MacMillam
KW  - Suelos
ER  -