“What do librarians use for bait when they go fishing?”/“Bookworms.”

A fishing riddle was printed in many newspapers in 1991 and 1992:
     
Q: What do librarians use for bait when they go fishing?
A: Bookworms.
 
A slightly different version was printed in the book School Jokes (2004) by Joseph Rosenbloom:
 
Q: What do librarians take with them when they go fishing?
A: Bookworms.
 
             
Newspapers.com
13 July 1991, Vancouver (BC) Sun, “Look for adventure at local libraries” by Marilyn Stusiak, pg. A13, col. 2:
What do librarians use for bait when they go fishing?
Bookworms.
 
Newspapers.com
3 November 1992, Daily Reporter (Greenfield, IN), “A Little Bit of Humor,” pg. 5, col. 3:
Joseph: What do librarians use for bait when they go fishing?
Mom: Bookworms.
 
Google Books
School Jokes
By Joseph Rosenbloom
New York, NY: Sterling Publishing Company, Inc.
2004
Pg. 38:
What do librarians take with them when they go fishing?
Bookworms.
 
Google Books
Srsly Best Jokes Ever:
Jokes for Kids
By Chantelle Grace
Racine, WI: BroadStreet Kids
2017
Pg. ?:
What do librarians take with them when they go fishing?
Bookworms.
 
Reddit—Dadjokes
Posted by u/iknowthisischeesy December 27, 2019
What do librarians take with them when they go fishing?
Bookworms.
 
Reddit—Dadjokes
Posted by u/VERBERD April 16, 2021
What do librarians take with them when they go fishing ?
Bookworms.