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A.F.S. Apprentice Training Standards for the Foundry Industry, Developed and Approved by Apprentice Training Committee, Educational Division, American Foundrymen's Society

American Foundrymen's Society. Educational Division. Apprentice Training Committee

出版	American Foundrymen's Society, 1949
URL	http://books.google.com.hk/books?id=hY9OAQAAMAAJ&hl=&source=gbs_api