United States Naval Observatory. (1881). Investigation of objective and micrometers of 26-inch equatorial constructed by Alvan Clark and Sons. [publisher not identified].
Chicago Style (17th ed.) CitationUnited States Naval Observatory. Investigation of Objective and Micrometers of 26-inch Equatorial Constructed by Alvan Clark and Sons. [Washington]: [publisher not identified], 1881.
MLA (9th ed.) CitationUnited States Naval Observatory. Investigation of Objective and Micrometers of 26-inch Equatorial Constructed by Alvan Clark and Sons. [publisher not identified], 1881.
Warning: These citations may not always be 100% accurate.