This image is a photograph of the earliest stages of Navaho weaving, as practiced in the early 20th Century. The women are shearing sheep, using manual sheep shears as seen in the hands of the woman on the right. It is slow, difficult work with live animals.

There is no description on the back of this card or the black and white ones that follow. They are photographs that have been cropped, printed on paper and stamped on the back with postcard markings for tourist use.
The caption states: Shearing sheep obtaining wool to be used in  Navajo Indian rug weaving, Gallup, New Mexico.
The card likely dates from the 1940s.