TY  - BOOK
AU  - Hays,W.M.
TI  - Plant breeding
T2  - U. S. Dept. of agriculture. Division of vegetable physiology and pathology. Bulletin
AV  - SB623 .A2 no. 29
PY  - 1901///
CY  - Washington
PB  - Govt. print. off.
KW  - Plant breeding
ER  -