This article is from the Firesign Theatre FAQ, by Niles D. Ritter firstname.lastname@example.org with numerous contributions by others.
220.127.116.11 Big book of plays:
Type of Material: Book
LC Call Number: PN6120.R2 F47
Author: Firesign Theatre (Performing group)
Title: The Firesign Theatre's big book of plays.
Publication Info: [San Francisco] Straight Arrow Books 
Phys. Description: 143 p. illus. 26 cm.
Subjects: Radio plays, American.
Other Names: Big book of plays.
LC Card Number: 72079024 //r82
ISBN: 0-87932-028-1 0-87932-027-3 (pbk)
There are at least two different versions of
"The Firesign Theatre's Big Book of Plays". The first printing (so
marked) has a red cover, with white and gold outlining the shape of
an old-time radio; the knobs are a little kid and a man in a sad-face
mask, and has two scantily clad women in silhouette, with a cover
price of $4.00.
The other version has a yellow border, an old-time radio at the top
of the page segues into a window at the bottom, through which a road
runs. A guy is waving through the window at four guys on the other
side, who are playing leap frog. The cover price is $5.95.
The first printing makes reference to a hardbound edition.
The SBN for the case bound in my book says 0/87932/028/1,
whereas the paperbound is 0/87932/027/3.