[Corpora-List] corpus of abstracts/papers with free-form keywords

[Mark Johnson]

I'm trying to evaluate unsupervised algorithms for identifying topical 
collocations in document collections.  One idea I've had is: if I had a 
corpus of abstracts or papers that have been manually labelled with 
free-form keywords, I could evaluate the degree to which the topical 
collocations match the human-annotated keywords.   Can anyone point me 
to a suitable corpus -- perhaps one that has already been used for this 
purpose?

Thanks in advance,

Mark Johnson

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