Topography of the Lunar Poles from Radar Interferometry: A Survey of Cold Trap Locations Margot, J. L. ; Campbell, D. B. ; Jurgens, R. F. ; Slade, M. A. Abstract Publication: Science Pub Date: June 1999 DOI: 10.1126/science.284.5420.1658 Bibcode: 1999Sci...284.1658M