One is; Buckeye Cookery, 1st edition, 1880. One other is; American cookery, Amelia Simmons Historic cookbook 1796 And I am prety sure the other is; The Art of Cookery made plain and easy, Hanna Glasse 1776 They had recipes to make Citron out of watermelon rind in them. I don't have them here but if your interested I will find them again and post. Mirianna