Yeah 1957, it was a vintage year for the palm wine industry in Cambodia, it was also an interesting year as the University of Pennsylvania sent a team here to do some filming, have a look at their efforts thanks to the Internet Archive.
http://www.archive.org/details/upenn-f16-0127_1957_23_Laos-Cambodia
http://www.archive.org/details/upenn-f16-0128_1957_24
http://www.archive.org/details/upenn-f16-0129_1957_25_Cambodia-Thailand
On each page you will be given the choice of streaming the video or downloading it, have fun!