Mr. Gusler certainly is a wealth of knowledge on Rifles from Virginia. All three videos are extremely informative, and are worthy of repeated viewing to absorb all of that information.
Wallace did another video on "Rifles of Botetourt County, Virginia" through the Historical Society of Western Virginia, several years ago. IMHO, this video is also, a must watch program for anyone interested in Virginia Rifles.
A search for "Wallace Gusler" on YouTube will turn up several shorter, informative, videos some of members of the forum might like to view.