Mason v. Montgomery Data, Inc.
967 F.2d 135 (5th Cir. 1992) - full text opinion
Under the very first laws recognizable as copyright legislation, the English government granted protection to the printing of books and maps. Note that the topographical maps Mason used were printed by the United States Geological Survey, and as such, were in the public domain.
Many different types of maps of Montgomery County are available through the web. You can view a topographical map of the county seat, Conroe, and find maps of individual properties in the county by using the on-line tax assessment database.