hello, i have a print that is marked 1958, by AAinc. on a Charles Russell painting/print. it is the" Lewis and Clark meet the flatheads". there is an auction tag as well, nicely preserved on the back with a similar date. it was a present from my father. we are from Montana, long history on both sides. Grandfather use to drink with him. anyhow. what does that mean, who is AAinc, and 1958 written in red paint, under his signature. i would be happy to send a photo of the art work/print? thanks sheri.