title: Mascons: lunar mass concentrations.
abstract: Lunar Orbiter tracking data have been processed to supply a qualitatively consistent gravimetric map of the lunar nearside. While a simplified model was employed, the results indicate that there are large mass concentrations under the lunar ringed maria. These mass concentrations may have important implications for the various theories regarding lunar history.
authors.forename: P M
authors.initials: PM
authors.lastname: Muller
authors.forename: W L
authors.initials: WL
authors.lastname: Sjogren