While going though some old magazines from my stash today I ran across this F & K Yarn Company sample book. There is no date on the catalog, but it is from the 1940's, judging by the fashions. It looks like they were pitching door-to-door sales by housewives here. I suppose they had "Yarn Parties" and pooled their orders. Anyway, it's fun to look at the amazing variety of wool and silk yarns that were available at the time.
I couldn't find anything on the F & K Yarn Company, but on one of the pages that I didn't reproduce here, their advisory board shows that Jane Franklin, Leading Authority in Hand Knitting, was their Chief Instructress, and on another page was listed J A Keller, Prop.