1
Izdano: 1932
Superior document: Publications of the Observatory of the University of Michigan 4,12
2
Izdano: 1923
Superior document: Studies of Class B stellar spectra containing emission lines 6
3
4
Izdano: 1932
Superior document: Publications of the Observatory of the University of Michigan 4,9
5
Izdano: 1923
Superior document: Publications of the Astronomical Observatory of the University of Michigan 3,[12]
6
Izdano: 1916
Superior document: Publications of the Astronomical Observatory of the University of Michigan 2,[11]
7
8
Izdano: 1923
Superior document: Studies of Class B stellar spectra containing emission lines 5
9
Izdano: 1916
Superior document: Publications of the Astronomical Observatory of the University of Michigan 2,[13]
10
11
Izdano: 1923
Superior document: Publications of the Astronomical Observatory of the University of Michigan 3,[13]
12
Izdano: 1934
Superior document: Publications of the Observatory of the University of Michigan 5,14
13
14
Izdano: 1923
Superior document: Publications of the Astronomical Observatory of the University of Michigan 3,[16]
15
Izdano: 1923
Superior document: Studies of Class B stellar spectra containing emission lines [7]