These links are either the sources of material or just great horology (alphabetically)...

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• Alexander has the largest collection of Soviet Watches YouTube Link. (all in Russian)

• Abbott. Henry G. The Watch Factories of America. 

• Arnold. Robert F. & Hernick. James L. Hampden Watch Co. 

• Canton history site http://www.ohiohistorycentral.org/w/Welcome_To_Ohio_History_Central

• Dueber Hampden in Canton http://www.zion-canton.org/centennial-history.pdf

• Dueber-Hampden Watches 1889, by Unknown. Broadcast April 3, 1949. Horological Library

• Engel. Joseph, Ex. Director. Canton Preservation Society.

• Gibbs. James W. http://www.amazon.co.uk/Springfield-Moscow-complete-Dueber-Hampden-story/dp/B00070ZNRS

• Hanson. Jon. http://www.americanhorologe.com/Mozart/Mozart.aspx

• Horrisberger. Lee. http://dueber-hampden.blogspot.com/

• James. Kevin. The Watch Guy. http://thewatchguy.homestead.com/pages/BENRUS.html

• Jansson. Maija. Shared Memory: John Hampden, New World and Old

• Kenney. Kimberly A. Canton: A Journey Through Time.

• McKinley Presidential Library & Museum. Canton, OH. USA. 

• Wein. Joe. Hampden Corporation

• Wilkie and Tager Hampden County

• Wirdnam. Paul. http://www.electric-watches.co.uk

• This is a specific link in the USSR-WATCH.COM site (see banner below). HERE you will find Soviet watch catalogs.

 Books in my collection (alphabetically)...

• Arnold, Robert F. & Hernick, James L. Hampden Watch Co.

• Blair, Harry. Mr Horology - The Life & Times of Henry B. Fried.

• Gibbs, James W. From Springfield to Moscow.

• Harrold, Michael C. American Watchmaking. 

• Sterling, Ronald E. Canton, Ohio (Images of America).

• Watkins Richard & Jacques, David American and Swiss Watchmaking in 1876.