Four US Department of the Interior US Geological Survey maps, dated 1961 and entitled “Engineer Special Study of the Surface of the Moon,” 52.5 x 38.5. Three maps show colorized versions of the lunar surface with the fourth bearing specific findings. The pages are contained within their original brown paper envelope. In fine condition, with intersecting folds (as issued) and some toning along the fold lines. RRAuction COA.
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