Excellent website by Skip Preusse for the mortar platoon of B/5-12, 1968 - 1969.
The 199th Report, Redcatcher Association
A superb website of French historians and serious Vietnam War enthusiasts that strive to accurately portray all aspects of the American involvement in Southeast Asia from 1960 - 1975 using period photography, uniforms, and Super-8 film.
Photo album for Alpha Company, 4th Battalion, 12th Infantry, 1966 - 1967. This site has some of the best high-quality images I have seen on the 199th.