I was also shocked to learn how many painting attributed to a famous artist were actually done by their students. Also the authentication process is very subjective. Like when a historian says things like “the boldness of the brush strokes” I also remind myself that most art value is derived from financial speculation and money laundering.
You can order paintings online from The Frederick Church School of Art, in various sizes of your favorite Frederick Church landscape, painted by one of the live students instead of the dead artist.