Historic maps

Sanborn Fire Insurance Maps were drawn town by town for fire-insurance underwriters, block by block and building by building, and revised every few years as a town grew or shrank. They are public domain. Five Blackland towns are here, from the Library of Congress: Blooming Grove, Frost, Hubbard, Kerens and Rice, the earliest sheet from 1888 and the latest from 1935.
The county
Maps from the Library of Congress, Sanborn Fire Insurance Map Collection. Public domain. County map: Courtesy of the Texas General Land Office, Austin. Map 73249, Navarro County, July 1924. Used under licence.