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For Your Information: When Will Worlds Collide?
Willy Ley
First published
July 1952
Type
Essay
Series
For Your Information
Publications (2)
Date
Publication
Publisher
Type
Page
July 1952
Galaxy Science Fiction, July 1952
Galaxy Publishing Corporation
MAGAZINE
75
May 1955
Galaxy Science Fiction, No. 26
Strato Publications
MAGAZINE
74