United States. Department of the Interior. (1924). Index to classification of patents, to accompany Manual of classification of patents; revised to Jan. 1, 1924. GPO.
Chicago Style (17th ed.) CitationUnited States. Department of the Interior. Index to Classification of Patents, to Accompany Manual of Classification of Patents; Revised to Jan. 1, 1924. [Washington]: GPO, 1924.
MLA (9th ed.) CitationUnited States. Department of the Interior. Index to Classification of Patents, to Accompany Manual of Classification of Patents; Revised to Jan. 1, 1924. GPO, 1924.
Warning: These citations may not always be 100% accurate.