1
2
Izdano: 1951
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 38
3
Izdano: 1937
Superior document: Annals of the Astronomical Observatory of Harvard College 89,10
4
5
6
Izdano: 1945
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series I 273
7
Izdano: 1945
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series I 274
8
9
Izdano: 1950
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 35
10
Izdano: 1946
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series I 282
11
Izdano: 1953
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 47
12
Izdano: 1960
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 161
13
Izdano: 1954
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 67
14
Izdano: 1957
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 108
15
Izdano: 1956
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 80