Time Travelers Strictly Cash

From Author Wars - https://authorwars.com/publications/time-travelers-strictly-cash-51569.html

Overview:

Title: Time Travelers Strictly Cash
Author: Spider Robinson
Year: 1981
ISBN-10: 0441812775
Publisher: Ace Books
Price: $2.25
Pages: 200
Binding: Paperback
Type: Collection
Title Reference: Time Travelers Strictly Cash
Notes: Cover artist not credited but cover is clearly signed "V Di Fate '80".
Second printing as per number line.
Four Callahan Stories, 4 NON-Callahan Stories, 3 non-fiction. Spider admits this was SUPPOSED to be a sequel but isn't really.
"Ol' Man Heinlein" is a song at the end of "Rah, Rah, R.A.H.!" and is not listed in contents.
"Serpents' Teeth" given as "Serpent's Teeth" in copyright but as "Serpents' Teeth" in ToC and start of story.