Alan, Don: Rubber Circus ©1958 Magic, Inc., Chicago, IL Softcover, saddle-stitched, 5.5x8.5", 15 pages Second Printing 1961 Third Printing 1966 Fourth Printing 1969 Fifth Printing 1977 Sixth Printing 1978 Seventh Printing 1980

Image courtesy eBay seller jkemmere142

Comments: Illustrated by Gene Gloye. These are not the most detailed descriptions, but if you've worked a bit with balloons it should be enough, and there are good bits of business and tips included.

Contents (from book):

2 Introduction
3 Making Short Lengths: basic moves
4 Making Tails
5 Dachshund
5 Using Colors
6 Creation of a Swan
7 Reindeer, Airplane, Giraffe
8 Hat Comedy
9 Monster, Sitting Monkey, Baby Doll, Rabbit
10 Candy Apple
11 Rocket Balloons
11 Bits of Business: Whale, running gag, static electricity, etc.
13 What To Do With Your Balloon Act: tips on gigs and performance
14 Magic Balloon - Pincushion: secret not provided
14 Magic Balloon - Spiker: secret not provided
15 Bits of Balloons (Jay Marshall): some balloon anecdotes and ideas