Geologic map of the Perrine (Jg-2) and Nun Sulci (Jg-5) quadrangles of Ganymede / U.S. Department of the Interior, U.S. Geological Survey ; by George E. McGill, Steven W. Squyres, and Steven J. Uzman ; prepared for National Aeronautics and Space Administration
Atlas of Jovian satellites. 1:5,000,000 geologic series Miscellaneous investigations series ; map I-2459 Geological Survey (U.S.). Atlas of Jovian satellites. 1:5,000,000 geologic series ; Jg-5. Miscellaneous investigations series (Geological Survey (U.S.)) ; map I-2459.