It was deemed historically significant for its association with early twentieth-century patterns of trade and commerce in Ingomar and Rosebud County.

As with most small towns in eastern Montana, Ingomar existed primarily as a retail trade center for farm and ranch settlers in the immediate vicinity.

The town's small business district was a focal of retail (and, consequently, social) activity for both the community and the surrounding countryside.

Bookman General Store was the largest mercantile in Ingomar, and a centerpiece of the town's commercial district.

The store's importance and prosperity is attested to by the building's relatively large size, substantial construction, and prominent location.