Count Yorinaga Matsudaira was a noted collector of miniature bonsai, and served as honorary president of the Kofuku Bonsai Association. His collection eventually reached a thousand specimens, but many were destroyed after his death (1944 I think) in World War II. Around two hundred specimens were preserved by his widow, who wrote an article for the 1953 Handbook on Dwarf Potted Trees issued by the Brooklyn Botanic Garden. In 1975, she published a book in Japanese, Matsudaira Mame Bonsai Collection Album, which included photos of the couple.