Other
Kitchen Musician Site: What Is a Hammered Dulcimer?
Here you can find a very thorough description of a hammered dulcimer, tracing this instruments creation and history. Pictures are also included.
Other
The Instruments of Celtic Music
Providing a brief overview of the most common instruments in Celtic music, this site also lists other links to search for further information.
Other
Hammer Dulcimers: What Do Hammered Dulcimer's Look Like?
Pictures of homemade dulcimers. A site for Charlie Alm's book "The Hammer Dulcimer".