Spectrum is a 16-book series with 16 primary works first released in 1994 with contributions by Arnie Fenner, David M. Bressoud, Edward J. Barbeau, Marlow Anderson, Robin J. Wilson, Victor Katz, Robin Wilson, Judith V. Grabiner, Martin Erickson, Steven G. Krantz, John de Pillis, and Jose' Wudka.