APA Citation

(1872). Classified Index of subjects of invention adopted in the U. S. Patent Office, March 1, 1872. Washington: Government Printing Office.

Chicago Style Citation

Classified Index of Subjects of Invention Adopted in the U. S. Patent Office, March 1, 1872. Washington: Government Printing Office, 1872.

MLA Citation

Classified 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.