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