TY  - BOOK
AU  - Evans, C.E.
AU  - Haas, H.J.
TI  - Nitrogen and carbon changes in great plains soils as influenced by cropping and soil treatments
U1  - 631.4 21st ed.
PY  - 0000///n. d
CY  - Colorado
PB  - United States Department of Agriculture
KW  - Carbon
KW  - Nitrogen
KW  - Soils
ER  -