country_car:
http://en.wikipedia.org/wiki/List_of_international_vehicle_registration_codes

country_isbn:
http://en.wikipedia.org/wiki/List_of_ISBN_identifier_groups
http://www.isbn-international.org/agency?rmxml=1 ???
http://www.isbn-international.org/range_file_generation

country_name, lang_name: iso-codes, Wikipedia, other? verified with Google Translate

lang_ab: ISO-631-1
lang_term: ISO-631-2/T
lang_lib: ISO-631-2/B
- the two latter differ only for bo,cs,cy,de,el,eu,fa,fr,hy,is,ka,mi,mk,ms,my,nl,ro,sk,sq,zh