UBV sequences in selected areas.
Contributors: United States Naval Observatory.
Series: Publications of the United States Naval Observatory -- 2d ser., v. 20, pt. 7
Publisher: U.S. Govt. Print. Off.
Published: 1974
Place of publication: Washington
Language: eng
Number of pages: 34
Subjects: Stars -- Catalogs.; Stars -- Magnitudes.
Genres: Catalogs.
Notes: Includes bibliographical references.