1
2
出版: 1951
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 38
3
4
5
6
出版: 1945
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series I 273
7
出版: 1945
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series I 274
8
9
10
出版: 1946
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series I 282
11
12
13
14
出版: 1957
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 108
15
出版: 1956
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 80