2 Vintage Jewel Tea Booklets Mary Dunbar’s Favorite Recipes The Jewel Cookbook.
The brown one I think is from the 1930s, it is in pretty good shape.  
There are a couple creases on the back cover.  
The yellow one could be 1940s or 1950s.  
The back cover got wet sometime in its life.  
Many of the page tops are very lightly wrinkled from water or something.