What does all this have to do with Dartmouth? Well, not much other than that this particular copy of the card was sent by Frost to Dartmouth College librarian Harold Rugg, and can currently be found in the collection of Dartmouth's Rauner Special Collections Library. The inscription reads:
Picture of a Witness Tree
As in my book about to be;
Which see R. F. to Harold Rugg
Rauner Special Collections Library, Dartmouth College, Hanover, N.H.