Koha MARC Tutorials - http://www.pakban.net/brooke/

Z39.50 Server Search - http://targettest.indexdata.com/

Z39.50 Server List - http://staff.library.mun.ca/staff/toolbox/z3950hosts.htm

Library of Congress Authorities - http://authorities.loc.gov/

MARC Country Codes - http://www.loc.gov/marc/countries/

Search the MARC Code List for Organizations - http://www.loc.gov/marc/organizations/org-search.php