[Spread of principal corn diseases in the RSFSR during the last five years]
1975
Fedorova, R.N. (Vsesoyuznyj Nauchno-Issledovatel'skij Inst. Zashchity Rastenij, Leningrad (USSR))
Fedorova, R.N. (Vsesoyuznyj Nauchno-Issledovatel'skij Inst. Zashchity Rastenij, Leningrad (USSR))