TY  - BOOK
AU  - Deere,John
TI  - Operator's manual: 4050 (006510) 4250 (009673) 4450 (019805) tractors 
T2  - John Deere Tractor Work's
U1  - R631.372 
PY  - 0000///[s.f]
CY  - [s.l]
PB  - [s.e]
N1  - Incluye índice
ER  -