1
2
Izdano: 1946
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series I 278
3
4
Izdano: 1939
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series I 181
5
Izdano: 1944
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series I 263
6
Izdano: 1935
Superior document: Annals of the Astronomical Observatory of Harvard College 89,6
7
Izdano: 1937
Superior document: Annals of the Astronomical Observatory of Harvard College 89,8
8
Izdano: 1946
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series I 281
9
Izdano: 1932
Superior document: Annals of the Astronomical Observatory of Harvard College 89,2
10
Izdano: 1952
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 41
11
12
Izdano: 1926
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series I 34
13
Izdano: 1936
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series I 123
14
15
Izdano: 1944
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series I 267
16
17
18
Izdano: 1933
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series I 91
19
Izdano: 1956
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 98
20