Thanks to the efforts of Jay Lurker, Jonathan Rochkind, and Adam
Constabaris,
​ Solr analyzer filters to normalize ISBNs (to ISBN13s) and LCCNs are now
cleaned up and ready to work with Solr 4.x.

I've extracted the code into a new repo, shined up the README, and provided
a .jar for download​ and instructions on what to do with it.

​Get it while it's hot at
https://github.com/billdueber/solr-libstdnum-normalize​

-- 
Bill Dueber
Library Systems Programmer
University of Michigan Library