Koha MARC Tutorials - http://www.pakban.net/brooke/
IRSpy Open Z39.50 Server Search - http://irspy.indexdata.com/
Z39.50 Server List - http://staff.library.mun.ca/staff/toolbox/z3950hosts.htm
Open Koha Z39.50 Targets - http://wiki.koha-community.org/wiki/Koha_Open_Z39.50_Sources
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
Search for Canadian MARC Codes - http://www.collectionscanada.gc.ca/illcandir-bin/illsear/l=0/c=1
Z39.50 Bib-1 Attribute - http://www.loc.gov/z3950/agency/defns/bib1.html