A multivariate study of selected correlates of course evaluations by students

TL;DR: A map, drawing or chart was part of the material being photographed, and the photographer followed a definite method in "sectioning" the material as discussed by the authors, which was referred to as map drawing.

Abstract: 3. When a map, drawing or chart, etc., was part of the material being photographed the photographer followed a definite method in "sectioning" the material. It is customary to begin photoing at the upper left hand corner of a large sheet and to continue photoing from left to right in equal sections with a small overlap. If necessary, sectioning is continued again — beginning below the first row and continuing on until complete.