I've been adding a lot of items to the Verified Editions pages, and you may wonder at how I can do it so quickly. All I have to say (for now) is that Google's special syntaxes are our friend. A Google search for
"cpdl #669" site:cpdl.org, for example, will result in exactly one result: Das zerbrochne Ringlein by Gluck, which is CPDL #669.
Just do this ... umm ... lots of times, keeping track of page titles and numbers in a spreadsheet. It's really helpful if your spreadsheet program has a CONCATENATE function. I haven't writen any of the links on the pages I've edited -- just have the program concatenate the title and page number with the appropriate Wiki markup -- [ [ Title | Number ] ]<br> -- and you're golden.