TY  - REP
AU  - Beppler,D.C.
AU  - Hoffman,L.D.
AU  - Shaw,M.D.
TI  - Petroleum energy requirements for Pennsylvania corn production systems
U1  - 82-805546 
PY  - 1980///
KW  - Energy resources and management
KW  - Maize
KW  - AGROVOC
KW  - Pennsylvania
KW  - Plant production
KW  - Zea mays
N1  - ill. 5 ref
ER  -