I finally did it.
http://www.pclink.com/elf/snelling.htm
shows the map & clues.

These letterboxes are airtight and watertight and flood proof.
Neither sleet nor snow nor rain nor hail shall keep the lettrbox
finder from the fun of finding these intact. The stamps inside
these letterboxes are hints (really more than hints) to my other letterbox on
the North Shore of Lake Superior.

Lynn: Fort Snelling, Minnesota is right on the way (well just
about on the way) to Art Continuum in Ohio... well, that is if
you're starting from Saskatchawan!

Dan'l
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