This data set contains visible-wavelength (0.435-0.925 micron) spectra for 1341
main-belt asteroids observed during the second phase of the Small Main-belt Asteroid
Spectroscopic Survey (SMASSII) between August 1993 and March 1999. The purpose of
the SMASSII survey was to provide a new basis for studying the compositional
diversity and structure of the asteroid belt. Based on experiences gained from the
earlier SMASS survey, SMASSII focused on producing an even larger, internally
consistent set of CCD spectra for small (D < 20 km) main-belt asteroids. The
observing strategies and procedures used during SMASSII roughly parallel those used
in the first survey (Xu et al. Icarus 115 1-35, 1995), though several minor changes
were made in instrumentation and in portions of the data reduction process.