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\section{Acknowledgment}  The author would like to thank the Executive Leadership Team of the HTRC, J. Stephen Downie, Beth A. Plale, Beth Naymachchivaya, and John M.  Unsworth, and all of the staff of the HathiTrust Research Center and the HathiTrust Digital Library for their contributions to the tools and services which that  make the concepts in this paper possible.