“These covers come from Bookcover Design in Japan 1910s-40s (ISBN 4-89444-426-7) edited by Masayo Matsubara. Published in 2005 by PIE Books, this incredible book is already out-of-print and becoming hard to find (it was actually hard for me to find and I spend hours per day searching for rare books). This book is in Japanese only, but of course you need it for the 650 illustrations.”