Hi C4L-- Just thought this might be a fun group to ping on this--sorry if it's off a bit. I'm looking for data sources that would help to portray aspects of the differences between academic, national, and public libraries. I think academic rigor would be a big facet, but not sure how to represent that quantifiably, other than audience level distinctions, and maybe cost somehow. Tentatively working with the idea for a model in 3D that has an ontology spectrum (call # range?) as x-axis, some measure of quantity (volumes held?) as y-axis, and academic rigor (per unit costs?) as the z-axis. If either the model or its data points tickle your fancy (or give it a rash, for that matter), or if you've seen something done along these lines, please let me know. Much obliged, --DBL David B. Lowe Data Librarian Florida Institute of Technology