Vernon, Dai; George Starke (editor): Impromptu Cups and Balls ©1949 Stars of Magic, Inc., NY Softcover, saddle-stitched, 8.5x11", 7 pages

Image courtesy eBay seller OddClem1

Comments: Photographs by George Karger, edited by George Starke. Stars of Magic Series 5, No. 1. Later part of the compilation book Stars of Magic, edited by George Starke.
Effect: A cups and balls routine using any three cups (paper covered cups in the text), four small balls or even wadded paper, and three large loads.

Contents (from entry in Stars of Magic):

2 Introduction
2 Preparation: the cups and placement of the balls
3 Routine Phase One
4 Phase Two
4 Phase Three
4 Phase Four
7 The Basic Sleight
8 Advertisement: for Stars of Magic series