TY - BOOK AU - Hewitt, E.C. TI - Agriculture science: for schools and colleges SN - 025896958X U1 - 630 2nd ed. PY - 1974/// CY - London PB - Crosby Lockwood Staples KW - Technology-Agriculture N1 - 1. Basic principle 2. The plant 3. The animal 4. The environment 5. Beneficial and harmful organism 6. Chemicals in crop husbandry ER -