1
Pubblicazione: 1960
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 162
2
Pubblicazione: 1951
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 38
3
Pubblicazione: 1937
Superior document: Annals of the Astronomical Observatory of Harvard College 89,10
4
Pubblicazione: 1938
Superior document: Annals of the Astronomical Observatory of Harvard College 89,13
5
Pubblicazione: 1959
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 158
6
Pubblicazione: 1945
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series I 273
7
Pubblicazione: 1945
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series I 274
8
Pubblicazione: 1934
Superior document: Annals of the Astronomical Observatory of Harvard College 89,4
9
Pubblicazione: 1950
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 35
10
Pubblicazione: 1946
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series I 282
11
Pubblicazione: 1953
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 47
12
Pubblicazione: 1960
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 161
13
Pubblicazione: 1954
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 67
14
Pubblicazione: 1957
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 108
15
Pubblicazione: 1956
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 80