This page
http://gurpswiki.wikidot.com/ind:occ...lates-by-genre
Seems to only index the Background Lenses added in supplementary Action products. I think it should list the Background Lenses in the
core Action vol. 1 PDF too. Also there was a very good Pyramid issue focusing on Action; I don't remember if it offered any Background Lenses, but if it does then those ought to be indexed too.