Goddess Saraswati impression dated 132 Advert excavated from Kankali tila depicts her holding a manuscript in her remaining hand represented being a sure and tied palm leaf or birch bark manuscript. In India a bounded manuscript product of birch bark or palm leaf existed side by side given that antiquity. https://davidhoffmeister.com/david-hoffmeister-the-message/metaphysics-of-a-course-in-miracles/