TY  - BOOK
AU  - Bartholomew, W.V., ed.
TI  - Soil nitrogen
T2  - American Society of Agronomy; no.10
U1  - 631.416.1 K5 
PY  - 1975///
CY  - Washington
PB  - American Society of Agronomy
KW  -  W.V.Bartholomew and Francis E.Clark.
KW  - Clark, Francis E., joint ed.
KW  - Soil-Nitrogen content
ER  -