Não informado. (1947). Processing equipment news. Barker Poultry Equipment.
Lua i Stíl Chicago (17ú heag.)Não informado. Processing Equipment News. Ottumwa, Iowa: Barker Poultry Equipment, 1947.
Lua MLA (8ú heag.)Não informado. Processing Equipment News. Barker Poultry Equipment, 1947.
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