Osborn - Collected Papers Volume 4... - New paperback or softback - X555z

Petrunkevitch - Collected Papers Volume 2... - paperback or softback - X555z

Grinnell - Collected Papers Volume 2... - New paperback or softback - X555z

Girty - Collected Papers Volume 3 - paperback or softback - X555z

Marshall - Collected Papers Volume 1... - paperback or softback - 50 - X555z

Kellogg - Collected Papers Volume 1... - paperback or softback - 58 - X555z

Ettingshausen - Collected Papers Volume 1 - paperback or softback - 8 - X555z

Ruckes - Collected Papers Volume 1... - paperback or softback - 79 - X555z