I ran across this video and it brought back some great memories. I'm not Navajo, but I grew up on the Navajo Reservation. My parents and grandparents operated trading posts all across the area. I lived for years in Fort Defiance, AZ, very near Window Rock Arizona, and in Crownpoint, NM and went to high school in Gallup, NM and rode a bus 57 miles each way.
One of my jobs was to stand in the burlap bag (the bags were much bigger than shown here) and stomp the wool down while someone threw the wool in. Lots of fun having dirty wool and ticks getting in your clothes.
This is a very good depiction of life there in the 1940s, 50s, and 60s. Horse drawn wagons were still very common then.