A new book by an English retiree compiles still classified Soviet maps of British and American cities:
On a business trip to Riga, Latvia’s capital, in the early 2000s, [John Davies] hit the mother lode. Davies happened upon a shop that held bundles of Cold War-era maps of British cities, created by the Soviet military. The maps were so detailed that they included such elements as the products factories made and bridges’ load-bearing capacity. “I was just amazed,” Davies said.
Each time Davies went to Riga, he would bring back another armload of the maps. And it turned out the Soviet military hadn’t just made maps of British cities: Davies discovered similarly intricate maps of U.S. cities, as well as areas across the globe. He and Alexander Kent, a professor of cartography at Canterbury Christ Church University, worked together to figure out how the maps were made. Their research can be found in a new book, The Red Atlas.
It's published in the US on my home-town imprint, the University of Chicago Press—and is at this writing out of stock on Amazon. (And of course I just ordered it.)