online authentication guides web pages - - -s
identifying and authenticating photographs in html format (old)
identifying and authenticating photos in pdf ebook format (up to date)
prints by the masters
pre-1930 baseball cards black light : a beginner's guide
forensic light: a beginner's guide (pdf)

philosophy/aesthetics/cognitive science/linguistics guides (all in pdf format)- - -s
understanding art perception (pdf)
return trip: aesthetics and epistemology (2014 Eric Hoffer Award Finalist)
strange beauty: aesthetics and epistemology (Follow up to Return Trip)
introduction to ancient counting systems (pdf)

-- blog, galleries, misc- - -
early baseball memorabilia galleries
about fashion photos
identfication and authentication column at sports collectors daily

books in print at Barnes and Noble
books in print at Barnes and Noble

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(c) david rudd cycleback