I also used Google Book Search recently for a personal project. I was reading James Beard's book American Cookery. The book contains a bibliography of old American cookbooks he had consulted. I found many of them online. Old cookbooks are fascinating, sexist reading. They include the following:
Beecher, Catharine. Miss Beecher's Domestic Receipt Book. New York 1846. 293 pp. The 1850 edition is online.
Chase, A. W. Dr. Chase's Recipes. Ann Arbor 1866. 384 pp.
The 1860 edition is online.
Cornelius, Mrs. Mary. The Young Housekeeper's Friend. Boston 1846. 190 pp.
The 1868 edition is online.
Harland, Marion. Common Sense in the Household. New York 1881. 546 pp.
The 1874 edition is online.
Peterson, Hannah Mary Bouvier. The National Cook Book. By a Lady of Philadelphia, a Practical Housewife. Philadelphia 1856. 301 pp.
The 1866 edition is online.
Webster, Mrs. A. L. The Improved Housewife. Hartford, Connecticut 1852. 236 pp.
The 1851 edition is online.