The core of this bibliography is based upon
information in
Robert Maier, et. al., GNU Plotutils version 2.4.1.
Particular thanks is due to its authors
for having tracked down the US National Technical Information Service
(NTIS;
http://www.ntis.gov/)
stock numbers for many papers by Dr. Hershey and others.
I have listed Dr. Hershey's papers in chronological
rather than alphabetical order.
The designation "[nr]" indicates that I have not
in fact read the item.
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