Removed the numbers from the Keeper map on page 186 for use as a player handout.
Map of the World
There's no traversing the world without a proper map, and Stanford's General Map of The World from 1922 is just the ticket, especially because it comes in an outrageously high resolution for all your printing or online VTT purposes.
The Westbury Hotel
The hotel where Commander J. B. Douglas stayed while he was in New York, The Westbury Hotel, was located on Scammel Street. A nice bit of research on the part of the BtMoM authors (I had to research it myself to figure out where it was supposed to be), since Scammel Street was one of several streets that were torn down in the 30s, to be replaced with Vladeck Park Houses, built in 1940.
All that remains of this street today is a path through that housing complex.
New York Map Circa 1930s
Here's a period correct map from cirka early 1930s of Manhattan and surrounding areas. Click through for print-ready size.