To get all this info, I have to do a lot of digging; which usually the reason why some posts are later than planned. These are the websites that I first go to when I need some historical background.

• www.ecured.cu
• www.wikipedia.org
• www.alternahistory.com (This one has always been finicky to connect to.)
• www.airwar.ru
• www.tupolev.ru
• https://translate.google.com
• www.secretprojects.co.uk (I don’t have an account on here, but I can glean lots of info.)
• Any book by Bill Gunston, Yefim Gordon, and/or Tony Buttler.