Found a website for Sunday River Productions. No mention of Alva, but I assume he is still running it. He does not list any stuff for Argentina, so I assume his film of C-14 never got into a production. Too bad, I would assume he has some pretty good stuff. We used up two tires getting our rental car from Salta to San Antonio de las Cobres where we boarded the train. Alva also should have gotten some good stuff on the Esquel line, since he was with me when some of my pix there were taken. His Brazil tape shows as being by Corbitt.
John