1
Published: 1932
Superior document: Publications of the Observatory of the University of Michigan 5,1
2
Published: 1934
Superior document: Publications of the Observatory of the University of Michigan 6,1
3
Published: 1935
Superior document: Publications of the Observatory of the University of Michigan 6,7
4
Published: 1934
Superior document: Publications of the Observatory of the University of Michigan 5,15
5
Published: 1932
Superior document: Publications of the Observatory of the University of Michigan 4,6
6
Published: 1933
Superior document: Publications of the Observatory of the University of Michigan 5,4
7
Published: 1934
Superior document: Publications of the Observatory of the University of Michigan 6,6
8
Published: 1932
Superior document: Publications of the Observatory of the University of Michigan 5,2
9
Published: 1935
Superior document: Publications of the Observatory of the University of Michigan 6,10
10
Published: 1934
Superior document: Publications of the Observatory of the University of Michigan 5,11
11
Published: 1936
Superior document: Publications of the Observatory of the University of Michigan 6,11