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Re:The Reddit world map – How to map out online social networks by privong on Monday October 27, 2014 @08:55PM (#8519000)
The Smithsonian/NASA Astrophysics Data System[0] has an API[1], though I am not sure it has all the information one would need to create such a graph.

[0] http://adsabs.harvard.edu/

[1] https://github.com/adsabs/adsabs-dev-api

Re:The Reddit world map – How to map out online social networks by drewbuschhorn on Monday October 27, 2014 @09:43PM (#8519140)
Thanks! I had seen the main site, which I had used lightly in analyzing arxiv papers, but I'd completely missed that they had a library on github.