TY  - BOOK
AU  - Langhans, Robert W.
TI  - Greenhouse management: : a guide to structures, environmental control, materials handling, crop programming and business analysis
U1  - 631.34 
PY  - 1990///
CY  - Ithaca, N.Y.
PB  - Halcyon Press
KW  - Invernaderos
ER  -