Greetings John Collier!
Welcome to the Forums and the world of Vintage Argosy ownership!
Originally Posted by JOHN COLLIER
Where can I find a manual for a 1976 20' Argosy?
Manuals for Argosy coaches are a little more difficult to find than for Airstream as I don't believe that Airstream is reproducing these as they are for the ones for the Airstream line. The Argosy manuals do come up periodically on E-Bay and will usually sell for between $30 and $80 depending upon condition and competiton for the particular manual. There is also one E-Bay merchant
who is producing selected manuals on CD -- you might want to check his store and contact him.
Good luck with your investigation!