Carr, M.H; Howard, K.A.; and El-Baz, Farouk.

Geologic Maps of the Apennine-Hadley Region of the Moon: Apollo 15 Pre-Mission Maps. – Washington, D.C.: Published by the U.S. Geological Survey, 1971. (Miscellaneous Investigations, Map I-723).

In 1965 the U.S. Geological Survey began issuing a series of geologic maps of the moon, which would eventually comprise a complete lunar geologic atlas. The scale of most of the maps is 1:1 million, or 136 inches to the moon's diameter, but there are two at 1:10 million (the entire moon), and one at 1:5000 (the floor of the crater Alphonsus). The first maps relied on earth-based photographs, especially those used for the Kuiper MDUL Photographic Atlas MDNM (see item 32). As the photographic results from the Ranger and Orbiter missions became available, they were quickly incorporated. When the Apollo program got underway, pre-mission maps of selected sites were issued at greater scale.

This map, one of a pair of the proposed Apollo 15 landing site in the Apennines, is at a scale of 1:250,000. The illustration, which represents only a small fraction of the large folding map, shows crater Hadley C (now just Hadley), the winding Hadley rill, and Hadley delta where Apollo 15 would touch down. The proposed landing site, right of center, is indicated by a small circle and cross. Image source: Carr, Michael H., Keith A Howard, et al. Geologic Maps of the Apennine-Hadley Region of the Moon: Apollo 15 Pre-Mission Maps. Washington, D.C.: United States Geological Survey 1971, pl. 1.

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