Theodore J. Waddell art links 

Montana Museum of Art and Culture, Missoula
Persistence

Sheldon Art Gallery, Lincoln, Nebraska
Longhorn #7

Yellowstone Art Museum, Montana
(Artists are listed alphabetically by first name)

 
National Art Databases and Museum Inventories:

Smithsonian Institution Art Inventories
List of works nationwide from two sources: the Inventory of American Paintings Executed before 1914 and the Inventory of American Sculpture (only a few percent of listings have an accompanying image)