If you’re heading to an unfamiliar city, and you anticipate using their subway system, you should check out Amadeus’ Subway Maps. Organized by continent, and further subdivided by cities, Subway Maps has printable PDFs of each of the dozens of subways featured — perfect for appending into your Moleskine City Guide. Each map is accompanied by images and basic information about each subway, including history and prices.
Larger than most travel guide’s subway maps, these maps have the added benefit of being free.