As Elaine pointed out in her earlier letter, we basically solved the our initial authority linking problem by fixing the 008 field, but this only fixed the "PERSO_NAME" authorities. Our TOPIC_TERM authority records were still not getting linked. These Names and Term authorities are locally maintained since the "regular" thesaurus's one might use like Library of Congress do not have the level of detail and specificity that this specialist resarch library requires (http://www.efdss.org/front/library-archive/about-the-vaughan-williams-memori...). We have this working now, but there were two issues. First and easiest to fix was that we were placing our TOPIC_TERMs in a 653 record, rather than a 650. C4::Heading::MARC21 has a table of bib_heading_fields, and 653 is not included. We researched 650 a bit and realized that we probably should just use that, but we wanted to be correct and not claim these terms were sourced from someplace like LC. So we created a 650, with a second indicator of '7' (other), and subfields 'a' set to the term, and '2' set to our library identifier 'UkLoVW'. When we tried to use link_bibs_to_authorities.pl, it failed to link these terms. Some debugging and generous printfs indicated that the problem was in the query against the Zebra index. Specifically, the problem was with the line: $limiters .= " AND Subject-heading-thesaurus=$self->{'thesaurus'}"; Commenting out this line (and thus the constraint that the entry in Zebra have a thesaurus of 'UkLoVW') solved the problem. Query before change: authorities:SimpleSearch(Match-heading,ext="Aberdeenshire" AND at='TOPIC_TERM' AND Heading-use-subject-added-entry=a AND Subject-heading-thesaurus=UkLoVW) Query after change: authorities:SimpleSearch(Match-heading,ext="Aberdeenshire" AND at='TOPIC_TERM' AND Heading-use-subject-added-entry=a) I don't know if this was the right thing to do and I suspect if I put in a patch to delete that line, it would be rejected. Here is an example (from marcdump) of one of our terms. This MARC was generated by a python program I wrote to convert from a bespoke term database to MARC so there could definitely be issues with this which I would happily fix. Comments are welcome. LDR 00234nz## 2200109n###### 001 AT-000001 003 UkLoVW 005 20101106220637.0 008 101106|ge|dz||aaan##########||||c###|d 035 _aAT-000001 040 _aUkLoVW _beng _cUkLoVW 150 _aAberdeen The real problem is why did Zebra not have our entries label with the correct thesaurus entry? Thiis code in C4::Heading/_query_limiters() looks a bit suspect anyways with lots of "FIXME" comments by someone. So where is the real problem - does Zebra need fixing? Our authority MARC records? Koha C4::Heading? What should we do to resolve this permanently? Regards, -Doug-