10 books
In the Footsteps of Columbus - Scholar's Choice Edition
The Henry Draper Catalog Volume 96-97
Spectra of Bright Southern Stars Photographed with the 13-Inch Boyden Telescope as a Part of the Henry Draper Memorial Volume 28
The Henry Draper Catalog, Volume 8
The Henry Draper Catalog Volume 91
Second Catalogue of Variable Stars Volume 55
In the Footsteps of Columbus
The Henry Draper Catalog, Volume 9
The Henry Draper Catalog; Volume 92
Henry Draper Catalog, Volume 94