The 3rd book was his first book and it was: Enameling on Metal
by Oppi Untracht
Chilton Company
copyright©1957
Library of Congress catalog card Number 57-11904
Sorry before the ISBN#
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9 chapters plus a comprehensive appendix

What is Enamel
Material and Tools
Making a Sampler
Preparations for enameling
Traditional Techniques
Techniques to Produce the unqiue
Techniques for Production Designs
Causes and Corrections of Defects
Enameling Projects
Appendix: that covers a wide range of materials and info

This was my first book on enameling and it opened a wondrous world of possibilities in the arena of metal arts. It cover everything from A to Z the only draw back today is that it was based on lead based colors used in the glass. Other than that and some minor things that have become better understood. Along with modern ways of doing things and supplies. I feel it is still as good now as it was then. I have the latest and have used some of the new materials. Other than the colors changing due to the lack of the hazardous chemicals that are no longer in the enamel.
Little did that Jr. high shop teacher think what he had wrought! I may not be a noted artist or for that matter more than a passable enamelist. But its has been a delightful ride along with a bunch of fun.
So you have three of the must have books if you are in metal arts two if you have no interest in the glassing of metal as a means of decoration.