I don't know whether there are any reference books written on the subject of collecting WW2 picture postcards; I doubt it. However, if you pursue the angle of Japanese war art from WW2, there are probably literature existing. Most of the original paintings made into postcards are still held by art museums and though this genre has been denied its value as art for decades ("artists who sold their soul to military propaganda"), there has been a move to study them without the emotional bias in these last few years.
I remember the Nikkei Newspaper running a series of war art articles in their art column a few years ago. If you visit the museums, that is where you are likely to pick up literature, but I suppose in your case that is a bridge too far.
I remember the Nikkei Newspaper running a series of war art articles in their art column a few years ago. If you visit the museums, that is where you are likely to pick up literature, but I suppose in your case that is a bridge too far.
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