David Mitchell, Howie's son, and the publisher of his classic 1960s book
The Mountain Dulcimer -- How to Make and Play It (after a fashion)
have just made the book available to the dulcimer building and playing public as a pair of downloadable PDF files.
The book has long been out of print and only available through libraries - although the publisher says they have a few copies on hand for sale... Find the links and discussion here:
The slightly different 1962, predecessor pamphletis available here:
These are not only fabulous resources for wannabe dulcimer builders, but also for players. Back when I got started playing, this and Jean Ritchie's Appalachian Dulcimer book were about all that were available.
updated by @ken-hulme: 06/11/15 07:30:02AM