Digital Library of Nutritional Advice from the USDA

Pyramids, foods, balanced diets? The National Agricultural Library at the United States Department of Agriculture (USDA) has created a digital library of nutrition guidance. “This collection allows users to browse and search the full text of over 900 historical and contemporary federal dietary guidance publications.” I did a couple of text searches. The oldest item I came across was from 1923, and was provided in PDF, MOBI, and EPUB formats.