Photometric Observations Made Principally with the Equatorial Telescope of Fifteen Inches Aperture During the Years 1877 - 79, by Edward C. Pickering, Aided by Arthur Searle and Winslow UptonEdward Charles Pickering
Photometric Observations Made Principally with the Equatorial Telescope of Fifteen Inches Aperture During the Years 1877 - 79, by Edward C. Pickering, Aided by Arthur Searle and Winslow Upton