Não informado. (1971). Ag chem and commercial fertilizer. Industry Publications.
Lua i Stíl Chicago (17ú heag.)Não informado. Ag Chem and Commercial Fertilizer. Cedar Grove, NJ: Industry Publications, 1971.
Lua MLA (8ú heag.)Não informado. Ag Chem and Commercial Fertilizer. Industry Publications, 1971.
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