Digging up camas roots

This came from a very interesting website that talks about why the camas roots are so valued in the Spokane culture. The particular section that I have put down here is about the tools used:

Digging camas, a job which fell to the girls and women, was hard work. Nearly six inches down in soil which was apt to be hard at that time of the year, they were difficult to get out with the simple digging sticks used for the purpose. These sticks were carefully made, usually of yew wood about 3 feet long, lightly curved, with a sharp 3-sided business end and a D-shaped handle of horn or antlers. The main shaft was nearly 2 inches thick, a strong and efficient tool. http://www.wellpinit.wednet.edu/sal-hist/reading.php?iinclude=../sal-hist/foodcama.txt

this website cited this source to be from: Food and Medical Plants of the Colville Area from the book of Steven Doyle