This is a field manual for identification of aircraft by Japanese soldiers. It is written in Japanese. You can see the condition in the pictures. The pages are browned with age. Some of the pages are dog eared. T are clearly US aircraft represented , but t may be aircraft of other nations as well. I am not an expert on aircraft or field manuals. Approximately 140 pages, by my count. Four pages toward the back of the book are torn, but t is no loss of paper. I will be happy to supply more photos, if you would like. This must be a rare item, as I can find nothing like it anyw If you know something more about this, please email me. Thanks.