1
2
Publicerad: 1951
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 38
3
Publicerad: 1937
Superior document: Annals of the Astronomical Observatory of Harvard College 89,10
4
Publicerad: 1938
Superior document: Annals of the Astronomical Observatory of Harvard College 89,13
5
Publicerad: 1959
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 158
6
Publicerad: 1945
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series I 273
7
Publicerad: 1945
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series I 274
8
Publicerad: 1934
Superior document: Annals of the Astronomical Observatory of Harvard College 89,4
9
Publicerad: 1950
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 35
10
Publicerad: 1946
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series I 282
11
Publicerad: 1953
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 47
12
Publicerad: 1960
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 161
13
Publicerad: 1954
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 67
14
Publicerad: 1957
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 108
15
Publicerad: 1956
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 80