USGS IMAP 566: Geologic map of the Ptolemaeus Quadrangle of the moon
USGS IMAP 566: Geologic map of the Ptolemaeus Quadrangle of the moonUSGS IMAP 566: Geologic map of the Ptolemaeus Quadrangle of the moon
By K. A. Howard and H. Masursky
Map and associated documents available from the USGS Publications Warehouse: https://doi.org/10.3133/i566