George Tscherny completed a bogglingly wide range of work standardizing the graphics for Pan Am in the early ’70s, redesigning everything from timetables to stewards’ aprons over the course of two years. These city guides are of a piece with the company’s other projects of that era, recalling both the bold imagery of Chermayeff & Geismar’s posters for the company and Tscherny’s own modular environmental graphics.