That's a bit of a letdown. This exhibition was the first major introduction of wet folding which allowed curved structures and opened up a whole world of possibilities. You can find plenty of images from Yoshizawa but I can't seem to find any from this in particular.

Origami books are still sold under his name. For example "Akira Yoshizawa - Japan's Greatest Origami Master" https://www.giladorigami.com/review-yoshizawa-origami-master...