Albedo features derived from Earth based International Planetary Patrol photographs selected from the collection at the Planetary Research Center of Lowell Observatory.
Published by Planetary Research Center, Lowell Observatory,
Copyright Lowell Observatory.

Maps provided courtesy of the USGS Flagstaff Library.

Mars 1969

Cartographers: JL Inge, CF Capen, LJ Martin, BQ Faure

Mars 1973

Cartography: J. L. Inge

Mars 1975-76