Spectrum
Spectrum is a 25-book series with 25 released primary works first released in 1994 with contributions by Arnie Fenner, Cathy 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.
#1 of 25 in Spectrum
1994 • 2 Readers • 5
#2 of 25 in Spectrum
1995 • 1 Reader • 200 pages • 4
#3 of 25 in Spectrum
1996 • 2 Readers • 3
#4 of 25 in Spectrum
1997 • 1 Reader • 144 pages
#6 of 25 in Spectrum
1999 • 1 Reader • 160 pages
#8 of 25 in Spectrum
2001 • 1 Reader • 176 pages
#9 of 25 in Spectrum
2002 • 1 Reader • 176 pages
#10 of 25 in Spectrum
2003 • 1 Reader • 176 pages
#11 of 25 in Spectrum
2004 • 2 Readers • 208 pages • 4.5
#12 of 25 in Spectrum
2005 • 1 Reader • 208 pages • 4
#13 of 25 in Spectrum
2006 • 2 Readers • 4
#14 of 25 in Spectrum
2007 • 2 Readers • 224 pages • 3
#18 of 25 in Spectrum
2011 • 2 Readers • 304 pages • 3
#19 of 25 in Spectrum
2012 • 1 Reader • 304 pages
#21 of 25 in Spectrum
2014 • 1 Reader • 4
#23 of 25 in Spectrum
2016 • 1 Reader • 5
25 Spectrum
2010 • 1 Reader • 307 pages
25 Spectrum
2004 • 1 Reader • 402 pages
25 Spectrum
2009 • 1 Reader • 448 pages
25 Spectrum
2014 • 1 Reader • 386 pages
25 Spectrum
1999 • 2 Readers • 292 pages
25 Spectrum
2000 • 1 Reader • 167 pages