Hydraulic Architecture, Volume Two, Part One

A graphic representation shows an open book. The left page is shaded with a dotted pattern and contains a large, bold letter A. The right page is white and contains a large, bold letter B. Technical text in French and an alphanumeric code appear below the graphic.

Insufficient contrast: A technical warning indicating that the visual difference between the ink and the background paper is too low for a clear reproduction.
NF Z 43-120-14: This refers to a specific French industrial standard for micrography and document conservation, ensuring the quality of archival copies.