I am looking for a copy of the paper in the title, appeared in the proceedings

"Combinatorics and algebra (Boulder 1983), Contemp. Math., 34"

and reprinted in

"Gian-Carlo Rota on Combinatorics, BirkhĂ¤user, 1995".

I have no way to get it. Does anyone have a scanned copy of it ? Thanks very much in advance.