Co-authors A. Guebhard and C. Dieudonné. Marbled-paper covered boards, spine possibly shagreen. Many fold-out tables of calculations, eight fold-out plates. Neat red stamp to bottom of half title and title page, “Ex-Libris Georges Bernard”. 25.5 cm by 16.5 cm. Condition: Boards knocked, worn at edges; some foxing to early pages. Two of the plates have been folded so as to leave the margins protruding from the boards, with resulting wear and rolling, and one of the plates has an extra fold. All plates, however, are clean and with no tears or wear into the diagrams themselves.