I would say these were available in the 50's to early 60's. Do you have whole pieces, selvedge to selvedge? The older yardage is approx. 36" wide, versus our 44" today (or 42"). So knowing WOF would be another clue for you. If you find no selvedge but find holes in straight lines, you have feedsacks, but those prints don't look like feedsacks to me.