I saw a old post on COPAC access not working. Most books I need to enter are from the UK. using MARC tools I can search and get the correct response, but in lookup I'm not getting any data. The Library of Congress lookup is working fine.
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Completely from memory, might be wrong: when experimenting with Lookup years ago, I used COPAC succesfully after changing Lookup to specify the Record syntax to be returned by the server to MARC.
Now, when retrieving http://copac.ac.uk/interfaces/z39.50//#connect , section Record syntaxes, I see MARC is not / will not be supported.