Bill, latter part of the '70's. A friend and I decided to partner up, pool our resources and go like heck trapping for a week. What we did then, I couldn't do now, but we trapped more 'rats than we had stretchers for - it took us a long time to get 'em all dried. We skinned and froze fur. It was a LONG, hard week we broke the 1,000 'rat mark.
We just concentrated on 'rats, nothing else. IIRC, we caught around 10 mink in the conibears that were set for 'rats.
He knew different areas to trap than I did, we hit an area really hard, and moved the traps every other day or so.
I could skin a 'rat in less than a minute after that season.