1
2
3
4
5
6
7
8
9
出版: 1932
Superior document: Annals of the Astronomical Observatory of Harvard College 89,2
10
出版: 1952
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 41
11
12
13
出版: 1936
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series I 123
14
15
16
17
18
19
20