I have been researching the same thing. Most of the hospitals were ones already existing in the country the US invaded and was taken over for military use. I am interested in the Pacific, mainly Guam and have had no luck. Much is written about Europe and some about the Phillipines and other Pacific locations. The local library has been a good source but also check local used bookstores. Let me know if you need a specific area and I'll pass on what I find.