Referring work: Schaber GG et al 1974 Interagency Report 64, Lava flows in Mare imbrium: An evaluation of anomalously low earth-based radar reflectivity. USGS

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#2322 Distribution of lowest levels (.074 to .090) of absolute visible albedo on the Lunar Earthside hemisphere, modified from Pohn et al. 1970 1974 #2728 Portion of Mare Imbrium showing distribution of depolarized 70 cm radar return with less than 50 percent the average power for the basin 1974