With a few exceptions, most of the following resources include large collections of links to digitized cookbooks or other materials.
18th-Century Cookbooks and Recipes
19th- & 20th-Century Cookbooks
Advertising Cookbooks from Duke University Collections
Beatrice McIntosh Collection (University of Massachusetts, some digitized recipes)
Chicone Citrus Label Collection, University of Florida
Community Cookbooks (University of Illinois at Champaign-Urbana)
Community Cookbooks (Iowa State)
Conrad N. Hilton Library Food History Digital Resources
Cookbook Digital Archive – Texas Woman’s University
Core Historical Literature Of Agriculture (Cornell)
Corpus of Culinary & Dietetic texts of Europe from the Middle Ages to 1800 (Thomas Gloning)
Digital Book Index (historical cookbooks)
Digitized Rare Books (Virginia Tech, mostly culinary) and History of Food & Drink Manuscript Collections
Early English Books Online (subscription only for full-text)
Escoffier’s A Guide to Modern Cookery
Folger Shakespeare Library, Digitized Receipt Books and Culinary Manuscripts
Fons Grewe (site in Catalan, 5000 titles in all, University of Barcelona)
Gallica (from the Bibliothèque Nationale de France)
Gastronomy Books: From the Library of Congress
Gloning’s Bibliographical Notes on Cookery, Wine, Beer, Etc. (Geographical sections)
Glossary of English Culinary Terms
HEARTH: Home Economics Archive Research Tradition History (Cornell)
Hearth Cooking – America – 1800-Civil War
Historic Cookbooks Online (most from Google Books)
Internet Archive (tremendous collection of old culinary and home economics texts)
Lemoyne 19th- and 20th-Century Cookbooks
Library of Congress Digitized Community Cookbooks (many from Internet Archive)
Manuscripts and Cookery Books Medieval Europe
Menus:
National Agricultural Library Digital Collections
Nicola Di Bona Peterson Collection of Advertising Cookbooks (Duke University)
Old Cookery Books and Ancient Cuisine (William Carew Hazlitt)
Online Books Page (University of Pennsylvania)
Online Cookbooks (medieval texts)
Online Culinary History Network
PALLM Collection (Florida University Libraries, cookbooks related to Florida cooking)
Professor Martha Carlin’s Site: Culinary Texts
Project Gutenberg: Cookery Bookshelf
Savoring the Past: 18th and Early Nineteenth Century Cookbooks: Searchable and Free
Service Through Sponge Cake (community cookbooks from Indiana University-Purdue University Indianapolis)
Szathmary Recipe Pamphlet Collection
University of Iowa, Szathmary Culinary Manuscripts and Cookbooks
University of North Texas, USDA Farmers’ Bulletins
University of Texas San Antonio Mexican Cookbook Collection
Utah State University Digitized Cookbooks
CYNTHIA D. BERTELSEN 
Ingebretsen’s, thank you!
Thank you so much for this fabulous resource!