ISBN 1164145320 books & textbook
Publications Of The Yerkes Observatory V4, Part 3: Parallaxes Of Fifty-Two Stars (1920)
Van Biesbroeck, George Pettit, Hannah Bard Steele
Kessinger Publishing /2010-09-10 Paperback / 44 Pages
isbn-10: 1164145320 / isbn-13: 9781164145325
