Fellow map catalogers, I have encountered a conundrum when searching out LC class codes to use in MARC 052 fields. In looking for the Irish Sea, I discovered that it appears in the LC classing tables in two places: with the British Isles as G5742.I6 and with the Atlantic Ocean as G9112.I7. Has anyone else encountered this (quick poking suggests there are a few other bodies of water with the same issue)? If so, how do you choose which classing to use? Best, Brenna -- Brenna Bychowski Catalog/Metadata Librarian Bibliographic Description Unit, Special Collections Technical Services Beinecke Rare Book and Manuscript Library | Yale University Library [log in to unmask]<mailto:[log in to unmask]> | 203.432.4850 she/her/hers