TY  - BOOK
AU  - "Christensen, J.J."
TI  - Corn Smut caused by ustilago maydis (A.P.S. Monograph no.2)
U1  - 632.485.1:633.15   K3 
PY  - 0000///Minesotta
CY  - 1963
PB  - American Phytopathological Soc.
ER  -