Letter from Samuel Clemens to Commissioner of Patents

Chicago citation style
Department of Commerce. Patent and Trademark Office. 1975. Letter from Samuel Clemens to Commissioner of Patents. 1871-09-09. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/6274032. (Accessed November 13, 2018.)
APA citation style
Department of Commerce. Patent and Trademark Office. 1975, (1871-09-09) Letter from Samuel Clemens to Commissioner of Patents. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/6274032
MLA citation style
Department of Commerce. Patent and Trademark Office. 1975. Retrieved from the Digital Public Library of America <http://catalog.archives.gov/id/6274032>.
Note: These citations are programmatically generated and may be incomplete.