E-DRUG: dur/due resources

E-DRUG DUR/DUE Resources
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For the interest of list members:

I've collected the URLs of several Web sites relating to
DUE/DUR. Methodology isn't explicity discussed on most (all?)
of them, but there are some good examples - and resources.

See:

http://www.rupert.net/~rtrinkle/dur.htm

Additional listings are welcome.