Official Gazette of the United States Patent Office United States. Patent Office Published: 1920 Total Pages: 854 Get eBook
Official Gazette of the United States Patent Office USA Patent Office Published: 1920 Total Pages: 630 Get eBook
The National Union Catalog, Pre-1956 Imprints Library of Congress Published: 1971 Total Pages: 712 Get eBook
United States Directory of Registered Professional Engineers Published: 1943 Total Pages: 684 Get eBook