"A map showing some of the sources of the raw materials which we use in making our pottery ..." hand-painted by Karl Martz, late 1930's.
The small building in a circle (detail below) at Indiana is a sketch of the Pink House" where the Karl Martz Studio was located at the time.
Direct scan from original. (Some water stains digitally erased in upper right corner. Darkened in "KM" where paint chips lost.)