He worked in water-based paint because he was allergic to oils. His fluid, relaxed paint handling and attention to edges shows his admiration of Joaquin Sorolla, John Singer Sargent, and Anders Zorn.
New website Harry Anderson Art
Jim Pinkoski's website on John Berkey
Another collection of Anderson art by Leif Peng
Book (mostly his religous painting): Harry Anderson: The Man Behind the Paintings