Schaber, Gerald G.; John F. McCauley. Geologic Map of the Tolstoj (H-8) Quadrangle of Mercury(PDF). U.S. Geological Survey. 1980 [2007-11-12]. USGS Miscellaneous Investigations Series Map I-1199, as part of the Atlas of Mercury, 1:5,000,000 Geologic Series. (原始内容存档(PDF)于2007-11-29).
Schaber, Gerald G.; John F. McCauley. Geologic Map of the Tolstoj (H-8) Quadrangle of Mercury(PDF). U.S. Geological Survey. 1980 [2007-11-12]. USGS Miscellaneous Investigations Series Map I-1199, as part of the Atlas of Mercury, 1:5,000,000 Geologic Series. (原始内容存档(PDF)于2007-11-29).