The Secret of the Ninth Planet
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Overview:
- Title: The Secret of the Ninth Planet
- Author: Donald A. Wollheim
- Year: 1973
- ISBN-10: 0446647535
- Publisher: Warner Paperback Library
- Price: $0.75
- Pages: 155
- Binding: Paperback
- Type: Novel
- Title Reference: The Secret of the Ninth Planet
- Notes:
- "First Printing: November 1965"
- "Second Printing: May 1973"; no number line
- Cover illustration credited to Zagorski on copyright page, no visible signature
- 64-753 on the cover, full ISBN on spine only