MIMURA joined a group of reproducing extremely valuable books, established in 1918 and sponsored by Seisaku YAMADA, in its second phase, and made a good contribution in searching and reproducing kikosho (extremely valuable book) for a long time.
稀書複製会（山田清作主催：大正7年創立）に第2期から加わり、以降長期にわたり、稀覯書の探索や複製に尽力する。