Parallel Time-Tracks

From Author Wars - https://authorwars.com/books/parallel-time-tracks-1601297.html

Overview:

Title: Parallel Time-Tracks
Author: H. Beam Piper
Year: 1948
Type: Short Fiction
Series: Paratime Police

Editions/Publications:

Unknown. Science Fiction Through the Ages 2 (Unknown, H. Beam Piper, Panther, 3/6, 173 pages, Paperback, Anthology)