" 
 ::::As long as the list of contributors is maintained, attribution requirements are met. Per Wikipedia:Reusing Wikipedia content, ""c) a list of all authors"" meets the requirements of WP:CC-By-SA (which is actually more than is required to meet WP:GFDL, which requires ""List on the Title Page, as authors, one or more persons or entities responsible for authorship of the modifications in the Modified Version, together with at least five of the principal authors of the Document (all of its principal authors, if it has fewer than five), unless they release you from this requirement."") The history serves to provide this, even if the text is redacted. What we can't redact, obviously, is the names of the contributors. 

 ::::I've been doing the same thing lately. Technically, WP:C procedures trump WP:REVDEL with copyright issues, but the procedures outlined in the WP:C advice are pretty onorous and result in nice, unwieldy lists that provide no more information, like so: ; Talk:Chatfield, Minnesota/Attribution.   "