From: utzoo!decvax!harpo!seismo!hao!hplabs!intelqa!omsvax!bb
Newsgroups: net.sf-lovers
Title: re: sf puns
Article-I.D.: omsvax.282
Posted: Thu Dec 30 09:00:02 1982
Received: Sat Jan  1 01:05:41 1983
References: sri-arpa.219

The story which involves the pun of the Farmers daughter (P.J. Farmer) and the
time traveling salesman is:
      Have you heard the one ... ?
      Spider Robinson
      Analog June 1980 p. 68
The story concerns Tall Tales night at Callahan's and includes far more than
the final pun.  

A friend claims that the story has appeared in an anthology, but I don't have 
the reference.