First mtb movie 1985
"Freewheelin"
https://youtu.be/7SzE1qjxWzw?t=594

Crested Butte Pear Pass Fat Tire Bike
https://www.facebook.com/groups/336533960015689/permalink/1534311810237892/

Among the early strong advocates of dropbars (flared of course) on mtb nebst Cunningham/Potts/Nicol Ibis & Wtb there actually was Bridgestone and Salsa of course..
some more info on G.Petersen´s influence here from the catalogs ->
# classic Off/Road DROPS ( American Aerodynamic Aluminum & Steel - A research!)
https://fotos.mtb-news.de/s/92009