There are no pages missing, as someone has proposed. The plates that are blank on the reverse are counted in the original page count, and thus if you count all the pages, also the blank ones, the page number will continue correctly.
Many thanks for the scanner and host.

All the histories of Kumihimo (a Japanese technique of braiding now very popular in the West) say that Kumihimo was first brought to the West in the mid-20th century by Japanese teachers who were initially very reluctant to share their art with non-Japanese students. This book would appear to give the lie to that. The diagrams are clearly kumihimo or closely related, and the so-called 'braiding board' is exactly like a marudai. However PLEASE NOTE that the PDF copy of this book is missing quite a few pages and a lot of illustrations.