Well I'm not sure...You say Rio Grande University?
this is what I found in our manuals
Delta Rho chapter, installed 1986, Rio Grande College, Rio Grande OH
Is that the same?
As for other info, sorry dunno
lol...I'm editing my post, again :P
From the AST National website:
University of Rio Grande Rio Grande, OH
Gamma Alpha* 1985
So it looks like they were installed a year before us....you know it may be a long awkward way to do things...but you could just look up every national's website roster :P