It' late teens, early and mid-twenties, look for the copyrite date. Dixie mags were an after market item for Model T Fords. Just remember, Henry Ford created the auto aftermaket when half the world drove Model T's.
Any thing that just says "Ford cars" without elaboration is from Model T days. You can do some dating by seeing if it mentions differences between cars with and without starters... I think I may have a Dixie ignition wrench/feeler gauge somewhere...