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you could make these books and use them for all kind of great curriculum and building skills, could be all nature with different leafs or multi culture/ anti basic and pick a country to pit in them, American sign language is awesome one as well. Little kids love these kinds of things from 12 months up to st least school age.
Custom Button Letter Wall Art -- Orange Monogram on Turquoise -- 8"x10" -- by Letter Perfect Designs on Etsy. $55.00, via Etsy.