Author
C.A.B. International. Information Services
1
Commonwealth Bureau of Soil Science
1
Commonwealth Bureau of Soils
1
Imperial Bureau of Soil Science
1
Institut nauchnoĭ informa︠t︡sii (Akademi︠i︡a nauk SSSR)
3
Na︠t︡sionalen agrarno-promishlen sŭ︠i︡uz (Bulgaria). ︠T︡Sentŭr za nauchno-tekhnicheska i ikonomicheska informa︠t︡si︠i︡a
1
Vseso︠i︡uznyĭ institut nauchnoĭ i tekhnicheskoĭ informa︠t︡sii (Soviet Union)
1