Sources
- Grolier, Maurice J.; Joseph M. Boyce (1984). "Geologic Map of the Borealis Region (H-1) of Mercury" (PDF). http://astrogeology.usgs.gov/Projects/PlanetaryMapping/DIGGEOL/mercury/h1/h1.pdf. Prepared for the National Aeronautics and Space Administration by the U.S. Department of the Interior, U.S. Geological Survey (Published in hardcopy as USGS Miscellaneous Investigations Series Map I–1660, as part of the Atlas of Mercury, 1:5,000,000 Geologic Series. Hardcopy is available for sale from U.S. Geological Survey, Information Services, Box 25286, Federal Center, Denver, CO 80225)
Read more about this topic: Borealis Quadrangle
Famous quotes containing the word sources:
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“The American grips himself, at the very sources of his consciousness, in a grip of care: and then, to so much of the rest of life, is indifferent. Whereas, the European hasn’t got so much care in him, so he cares much more for life and living.”
—D.H. (David Herbert)