[Koha] Problems with z39.50 search results from Library of Congress

We are having some problems retrieving results from the z39.50 search to Library of Congress. We have verified that these items are in the LOC database, but do not come up in the Koha z39.50 search. Examples. "And the Mountains Echoed," ISBN-10: 159463176X or ISBN-13: 978-1594631764 will not retrieve results. "Life after Life" ISBN-10: 0316176486 ISBN-13: 978-0316176484 will not retrieve results. Has anyone else experienced this and is this a bug (I did not see any issue in Bugzilla?) Jerry Carbone, Library Director Brooks Memorial Library 224 Main St. Brattleboro, VT 05301 802-254-5290, ext 101 802-251-8195