1
Published: 1963
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 200
2
Published: 1960
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 166
3
Published: [2013]
Superior document: Title is part of eBook package: De Gruyter HUP e-dition: Complete eBook Package
Links: Get full text; Get full text; Cover