l'architecture mobile

It seems that both books are in fact manuscripts upon which Constant has commented.

In the first (note)book, A37.12-B, a dedication is written: 'à Constant amicalement Yona Friedman'.

In 37.13-B comments ar written or markings are made on page: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 16, 25.

In 37.13-B is also: A (manuscript of an?) article for the catalogue of an expostion in Stedelijk Museum Amsterdam and Moderna Museet Stockholm; an article with the title 'Programme d'actualité pour un arbanisme mobile' from a magazine called Revue Technique de Batiment, by Yona Friedman;  a torn page from a book or magazine of another text by Yona.