Box-folder 62:17

Scope and Contents From the Sub-Series: The subseries is organized in three sub-subseries: Astronomical Subjects, Miscellaneous Subjects, and UFO Related Files. The files in Astronomical Subjects primarily contain notes by Tombaugh on books and journal articles. In some cases a packet of notes, or even a single page, may include notes on two or more distinct topics. In these cases the notes are filed under the predominant topic, with additional topics listed in parentheses. Also in Astronomical Subjects is an astronomy notebook...