I'm trying to locate a downloadable copy of the LC Classifications (LCC) in a structured format that expresses the hierarchy - SKOS, thesaurus, XML, whatever - in order to study its spatial and temporal content. I've located a tab-delimited copy and have began encoding parent-child relations, but it's very time-consuming (https://archive.org/details/LcClassificationA-z).
The LC linked data group has a search interface to a few classes, but it's a download of the whole thing I'm after and they say it's not available. Seems like it should be, being government-funded and all...
Stanford University Libraries