Very nice lot of four vintage recipe booklets circa 1917 or earlier?

Savory prize recipe book for the savory roaster -original string

Jell-O, ice cream powder and Jell-O recipe booklet-beautiful illustrations -original strain

55 ways to save eggs copyright 1917 royal baking powder company

Best war time recipes, Royal baking powder, Company New York, copyright 1918

Good vintage condition - these are 100+ years old