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.