Hackman, Robert J. (research and compilation)
Modified 1961 Engineer Special Study of the Surface of the Moon
Greyscale units, linework
1:9M (approx), originally compiled at 1:3.8M
Prepared for the Office of the Chief of Engineers by the U.S. Geological Survey, as part of a joint program with the Army Map Service
Source: AC Mason, RJ Hackman, Photogeologic study of the Moon. In: Kopal Z, Mikhailov ZK, 1962 eds: The Moon. Academic Press. London and New York. Large size supplement to the book.