I conducted a Natural Dye workshop for the Saskatoon Spinners and Weavers Guild. There were 10 students. We were welcomed by one of the Guild member's homes to have the workshop there in the country, over-looking the river just near Waneskewin National Heritage Site.
I discovered this book and it's wonders many years ago in Duthie's Books; Vancouver's then-famous bookstore. It was a treasure to find since I had just come back from far-flung travels.