Time Machine to the Rescue

From Author Wars - https://authorwars.com/books/time-machine-to-the-rescue-961051.html

Overview:

Title: Time Machine to the Rescue
Author: Keith Monroe Donald Monroe
Year: 1967
Type: Novels
Series: Time Machine (Keith and Donald Monroe)
Number in Series: 2

Variant Titles:

1967. Time Machine to the Rescue