Ya know, a few years ago I was looking for the same thing. Couldn't dig anything up. I have a Husker room with all my memorabilia displayed, and thought it would be cool to replicate the four corners, but could never find anything. Maybe next time I'm in Lincoln I'll just go take the pics myself.
The other sayings:
"In the Commemoration of
the men of Nebraska
who served and fell
in the Nation's Wars"
"Courage; Generosity;
Fairness; Honor; In
these are the true
awards of manly sport."
"Their Lives they held
their countrys trust;
They kept its faith;
They died its heroes."