ERIC ED541465: Survey of the Schools of Wilmington, Delaware. Part 2: I. The Elementary Courses; II. Secondary Education; III. Special Departments and Subjects. Bulletin, 1921, No. 2
This is a 1921 bulletin from the Wilmington, Delaware school survey, part of a government-issued educational report on elementary courses, secondary education, and special subjects, prepared for school administrators and city officials. Its one picture is a set of four small line graphs comparing promotions across grades one through six in Butte, Cleveland, and Wilmington schools, with solid and dashed lines plotted over grade labels and a caption about pupils with reading failures. A designer could take the clean grid-and-line-chart layout as a model for simple data graphics, with the two-line contrast in each panel showing how plain black strokes separate series.
