From the DVD:
"The documentary/expeditiary film Matto Grosso has a terrific back story; its production was launched by an unlikely band of scientists and Hollywood crew members, together with the engineer E.R.F Johnson of Victrola, with the express purpose of being the first documentary crew recording sync sound in the field."
"Matto Grosso, the Great Brazillian Wilderness * dir. Floyd Crosby, et al. (1931)
(48:00, black and white, sound)
An expediton set sail from NYC in 1930 toward Matto Grosso Brazil to create a record of the rainforest and people who live there. This feature short premiered in New York City in 1931."