This map was compiled from Voyager 1 and 2 pictures of Callisto. Placement of features is based on predicted spacecraft trajectory data and is highly approximate. The linkage between Voyager 1 and Voyager 2 pictures is particularly tenuous. Placement errors as large as 10° are probably common throughout the map, and a few may be even larger. Feature names were approved by the International Astronomical Union in 1979. Airbrush representation is by P. M. Bridges. Jc 25M 2RMN: Abbreviation for (Jupiter) Callisto, 1:25,000,000 series, second edition, shaded relief map, R, with surface markings, M, and feature names, N. [Illustration: North polar region; South polar region] Scale 1:13 980 000 at 56° latitude Polar stereographic projection [Illustration: Callisto] Scale 1:25 000 000 at 0° latitude Mercator projection Preliminary Pictorial Map of Ganymede Atlas of Ganymede 1:25,000,000 Topographic Series Jg 25M 2RMN, 1979 I-1242 This map was compiled from Voyager 1 and 2 pictures of Ganymede. Placement of features is based on predicted spacecraft trajectory data and is highly approximate. The linkage between Voyager 1 and Voyager 2 pictures is particularly tenuous. Placement errors as large as 10° are probably common throughout the map, and a few may be even larger. A large unresolved discrepancy exists in the area bounded by the -45° and -55° parallels between 120° and 180° longitude. Relative placement of features is distorted in that area. Feature names were approved by the International Astronomical Union in 1979. Airbrush representation is by J. L. Inge. Jg 25M 2RMN: Abbreviation for (Jupiter) Ganymede, 1:25,000,000 series, second edition, shaded relief map, R, with surface markings, M, and feature names, N. [Illustration: North polar region; South polar region] Scale 1:13 980 000 at 56° latitude Polar stereographic projection [Illustration: Ganymede] Scale 1:25 000 000 at 0° latitude Mercator projection Preliminary Pictorial Map of Europa Atlas of Europa 1:25,000,000 Topographic Series Je 25M 2RMN, 1979 I-1241 This map was compiled from Voyager 1 and 2 pictures of Europa. Placement of features is based on predicted spacecraft trajectory data and is highly approximate. Feature names were approved by the International Astronomical Union in 1979. Airbrush representation is by J. L. Inge. Je 25M 2RMN: Abbreviation for (Jupiter) Europa, 1:25,000,000 series, second edition, shaded relief map, R, with surface markings, M, and feature names, N. [Illustration: North polar region; South polar region] Scale 1:13 980 000 at 56° latitude Polar stereographic projection [Illustration: Europa]