In 1903 Carl Albert Kroll (1882-1982) immigrated from Germany to the U. S., finding work as a drafting technician at the Moran Brothers shipbuilding company. By 1910 Kroll was the manager at O. P. Anderson Map & Blue Print Company. The following year he acquired both the Anderson Map Company and the Washington Map and Blueprint Company to form the Kroll Map Company. Kroll sold the company in 1920 to friend and employee John Loacker (1874-1964), whose grandson still runs the family business in Belltown as of 2019.

This Kroll map of Seattle identifies many places of interest throughout the city. The legend includes symbols denoting main thoroughfares, boulevards, parks, railroads, auto ferries, schools, and gas and trolley buses. The upper left corner of the map identifies trolley and motor coach routes, with downtown boarding locations and connections noted. The inside cover includes a map titled "Proposed Downtown Routes Seattle's New Trackless Trolley and Bus System."

Caption information source: "The mapmaker, a 106-year-old Seattle business, and a strange request for a map," The Seattle Times, March 23, 2018, p. 100.