If you're interested in historic cookbooks, you must go to the link below.
The Michigan State University Library has a project called Feeding America: The Historic American Cookbook Project.
Here's a description of the project from their website:
"The Michigan State University Library and the MSU Museum are partnering to create an online collection of the most important and influential 19th and early 20th century American cookbooks.
The digital archive currently includes page images of 47 cookbooks from the Special Collections Division of the MSU Library. The text-search function currently indexes six books. When the project is completed in September 2003, the site will include page images, full-text transcriptions, and indexed text searching for 75 cookbooks published between 1798 and 1922."
This is an incredible website! Here's the link: