Não informado. (1919). Cement, Mill and Quarry. National Trade Journals.
Lua i Stíl Chicago (17ú heag.)Não informado. Cement, Mill and Quarry. New York: National Trade Journals, 1919.
Lua MLA (8ú heag.)Não informado. Cement, Mill and Quarry. National Trade Journals, 1919.
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