The US Forest Service’s Vintage Cocktail Guide

Little known fact: in addition to preserving our wildlife and preventing forest fires, the US Forest Service is surprisingly chock full of cocktail experts. Cool Material recently discovered this 1974 Cocktail Construction Chart detailing their favorite cocktails and how to make them.    

The entire guide is coded by liquor according to patterns as seen above, and includes handy little notes on how to craft the perfect mixed drink. And seeing as the chart was drafted by engineers you know it’ll be precise. 

Check out the Cocktail Construction Chart in the National Archives.