Slit Spectroscopy Of Asteroids: The Search For Water Of Hydration Alpert, A. J. ; Leake, M. A. ; Watkins, L. S. ; Semmes, K. E. ; Kilgard, R. Abstract Publication: International Amateur-Professional Photoelectric Photometry Communications Pub Date: March 1998 Bibcode: 1998IAPPP..71...87A