Add De Nederlandse Bibliografie as an external identifier. The format is http://picarta.pica.nl/xslt/DB=3.9/XMLPRS=Y/PPN?PPN=# where "#" is the ID . See http://www.isfdb.org/wiki/index.php/User_talk:Wjmvanruth#Data_from_the_Royal_Dutch_Library for details.
Anonymous
Implemented in scripts/scripts add_De_Nederlandse_Bibliografie.sql 1.1, installed in r2017-298 on 2017-08-20. Closing.