Smithsonian Astrophysical Observatory.
Star catalog : positions and proper motions of 258,997 stars for the epoch and equinox of 1950.0. / prepared by the staff [of the] Smithsonian Astrophysical Observatory.
— Washington, D. C. : Smithsonian Institution [for sale by the Superintendent of Documents, U.S. Govt. Print. Off.], 1966. 4 v. : il. ; 27 cm. — (Smithsonian publication ; 4652)
"Sources for the catalog": v. 1, p. xx-xxiv.
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