Baltimore County, Maryland Historic map, Library of Congress

Title in lower margin: Baltimore Co., Md. : N3909--W7615/35X39.5, 1977.
"Compiled in 1977 from USGS 1:24,000-scale topographic maps dated 1953-1974."
"Planimetry revised from photographs taken 1976 and other source data."
"1-16171."
Available also through the Library of Congress Web site as a raster image.