The American Buckeye Poultry Club provides the below history resources for the heritage breed:
An article written by Nettie Metcalf herself, for the Pacific Fancier Magazine in their Volume VII, No. 4, April 1909 edition. The article has been scanned in its entirety, and contains some pictures of her birds and both her farms: the one in Ohio where she created her famous birds, and in California where she subsequently moved. It even has information on the birds she used to create her Buckeyes, and the breed club she founded and was President of, The National Red Feather Club.
As well, here is an article about the history of the Buckeye chicken, written by Mrs. Metcalf herself, that was published in the October, 1917 edition of Poultry Success magazine.
There is great section on Buckeye chickens in the historical book “The Mating and Breeding of Poultry” by Harry M. Lamon and Rob R. Slocum.
A comparison between Buckeye and Rhode Island Red chickens, from the May, 1912 copy of American Poultry Advocate.