(1872). Classified Index of subjects of invention adopted in the U. S. Patent Office, March 1, 1872. Washington: Government Printing Office.
Chicago Style CitationClassified Index of Subjects of Invention Adopted in the U. S. Patent Office, March 1, 1872. Washington: Government Printing Office, 1872.
MLA CitationClassified Index of Subjects of Invention Adopted in the U. S. Patent Office, March 1, 1872. Washington: Government Printing Office, 1872.
Warning: These citations may not always be 100% accurate.