Brasseys for 1919, 1920, and 1921

If you are interested in the ships planned but not built due to the Washington Naval Treaty, the 1919, 1920, and 1921 Brassey's Naval Annual volumes are a "must read". One of the features that I particularly was interested in was the lists of guns that were either planned or under develpment by the various nations. If nothing else, you can see the manifestation of what information made its way into the public eye, whether it was correct or not. Copies, when found, are often over $100 (US).