Celilo Falls Fishing on the Columbia River, Oregon (gallery)
Whaling Log of Thomas Knowles, 1859.
Horses at War (gallery)
Horses in Agriculture (gallery)
Horses in the City (gallery)
"Influence of Railroads Upon Agriculture," Agriculture of the United States, 1860.
The Horse Disease, Chicago Daily Tribune, 1872.
"The Position of the Horse in Modern Society," The Nation, 1872.
"Comparative Costs and Profits of Cable, Electric and Horse Railway Operation in New York City," Street Railway Journal, 1898.
United States Horse and Mule Population, 1840-1920.
Horse and Mule Population Statistics