Proof (collected editions) is a 6-book series with 6 primary works first released in 2008 with contributions by Joe Kelly, Riley Rossmo, Alex Grecian, and Chris Grine.
2008 • 1 Reader • 3
2008 • 1 Reader • 128 pages
2009 • 1 Reader • 3
2010 • 1 Reader
2010 • 1 Reader • 128 pages
2011 • 1 Reader