Boothbys World Drinks and How to Mix Them: 1934 Reprint 

This book was written by "Cocktail" Bill Boothby, once a minstrel performer, then San Francisco bartender and author of "American Bar-Tender", and finally California Assemblyman. Complete with over 150 mixed drinks, it was first published right after prohibition, and is fantastic as an "unabridged encyclopedia of all popular beverages". Broken down by category (cocktails, highball, fizzes, etc.) then by alphabetical name instead of by liquor. This allows a bartender to make the cocktail and still look like he is an expert, because he can reference it in this book under the bar. 

Forget about bar bibles or encyclopedias, what about drinks that people really used? As so few bar books were written and even fewer survived at all from the past 100 years, it is a great pleasure to be able to bring these drinks that were used at the time to our modern attention and use.