A tentative classification of long period variables
By: by Leon Campbell
Series: Harvard reprint -- 21
Publisher: Astronomical Observatory of Harvard College
Published: 1925
Place of publication: Cambridge, Mass
Language: eng
Number of pages: 36
Subjects: Variable stars; Classification
Notes: Cover title.

"Reprinted from Variable Comments, Vol. I, No. 4, a publication of the A.A.V.S.O."

"Address delivered by the president at the meeting of the American Association of Variable Star Observers, held in New York, May 12, 1920."