The Door Into Summer (Part 3 of 3)

From Author Wars - https://authorwars.com/books/the-door-into-summer-part-3-of-3-113393.html

Overview:

Title: The Door Into Summer (Part 3 of 3)
Author: Robert A. Heinlein
Year: 1956
Type: Serials

Editions/Publications:

Unknown. The Magazine of Fantasy and Science Fiction, December 1956 (Unknown, Robert A. Heinlein, Fantasy House, Inc., $0.35, 132 pages, digest, MAGAZINE)