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What kind of text documents are you looking for? and what do you consider an associated ontology?
I was about to say DBpedia, but I guess what you want is a set of (natural-language) text documents, not RDF data, so DBpedia isn't the answer.
try pubmed.com - medical abstracts with manually added MeSH terms (also check out UMLS).
Or you're looking for automated ontology generation/extraction benchmarks?