Dissident Voice: here and here. I even did a review of that documentary,
The People VS Agent Orange, which highlights Tran To Nga‘s fight in France “Eternal Impunity of Capitalism’s Crimes“. Here’s one passage from that story I wrote:
Dr. James Clary was with the Air Force in Vietnam, which ran the program. He was ordered to dump the computer and erase all memory. Instead, he printed out a stack of documents two feet high – missions, sorties, coordinates, dates, gallons dropped throughout all of Southeast Asia and Laos.
“We had the information coming from Dow that there were real problems for people associated with this chemical. It was all locked up for 35 years.”