Astronomer, Professor of Astronomy at the University of Illinois, 1903-1922.
From the description of Addition to papers, 1918-1948. (Unknown). WorldCat record id: 155006438
Astronmer; Professor of Astronomy at the University of Illinois, 1903-1922.
From the description of Papers, 1907-1957 (bulk 1907-1923). (Unknown). WorldCat record id: 84940119