TY  - BOOK
AU  - U.S. Department of Agriculture
TI  - Pathogenic specialization in cerealrust fungi especially puccinia recondition f. sp. tritici concepts methods of study a
T2  - Tachnical bulletin, no. 1432
U1  - 581.2 
PY  - 1971///
CY  - Washington
PB  - The Author
ER  -