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.
1994 • 1 Reader • 5
1996 • 1 Reader • 3
2004 • 1 Reader • 208 pages • 5
2012 • 1 Reader • 304 pages
2014 • 1 Reader • 4
2016 • 1 Reader • 5
8 Spectrum
2004 • 1 Reader • 402 pages
1999 • 1 Reader • 292 pages
2011 • 1 Reader • 193 pages
2010 • 1 Reader • 307 pages
2000 • 1 Reader • 167 pages
2011 • 1 Reader • 157 pages
2009 • 1 Reader • 448 pages