Second Catalogue of Variable Stars. [In] The Annals of the Astronomical Observatory of Harvard College. Volume LV. – Part I [of II].
Cambridge, Mass. Published by the Observatory, 1907. First printing. The Second Catalogue is the later, finalized version of Cannon’s Provisional Catalogue of Variable Stars, which was published by the Harvard Observatory in 1903 and contains about 1,200 stars catalogued by Cannon. The Second Catalogue includes 25,000 stars catalogued by Cannon.....