1
2
3
Published: 1958
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 122
4
5
6
7
Published: 1961
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 179
8
Published: 1967
Superior document: Smithsonian contributions to astrophysics 10,1
9
Published: 1960
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 161
10
Published: 1954
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 67
11
Published: 1957
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 108
12
Published: 1956
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 80