Williams & Heintz Map Corp. printed the Tectonic Map of Mexico in 1961 for the Geological Society of America. The map was compiled by Zoltan de Czerna. The Bathymetry was compiled by Bruce C. Heezen. The preparation of the base map and final drafting was done by David Saldaña. They spent the years from 1956 to 1959 compiling and preparing this map.
After printing, we would inspect each individual sheet. Because even though this is a multi-color map, it was printed on only a two color press, a more common press in the early 1960’s. This required the paper to be fed through the press multiple times. The difficulty was, that if the paper did not feed into the press exactly the same every time, it would result in a misregistration of the image. Since the run lengths of these jobs was rarely more than several hundred we used to run a significant amount of overs and when the job was finished each sheet would be individually inspected to catch the misregistered sheets.
This level of inspection is not possible with runs in the millions, so today it’s a good thing we have six color presses.
For more information on print registration and map colors see: