TY  - BOOK
AU  - Porter,Keith S.
TI  - Nitrogen and phosphorus: food production, waste and the environment
SN  - 0250401118
U1  - 631.84 
PY  - 1975///
CY  - Michigan
PB  - Ann Arbor Science Pub.
KW  - Waste products as fertilizers
KW  - Nitrogen fertilizers
KW  - Phosphatic fertilizers
KW  - Agricultural productivity
KW  - Agricultural wastes
KW  - Address, Essays, lectures etc
N1  - Includes index
ER  -