Out-of-Print Newbery

My fifth graders are required to read at least five Newbery books to earn their school award. Most read the popular ones such as Charlotte's Web and Holes. In discussion with the school media specialist about the of recent Newbery Award winners, she mentioned that several of the past winners were out of print. I thought you might be interested in knowing that only four of the Newbery books are out of print:

1925 -- Tales from Silver Lands by Charles Finger

1932 -- Waterless Mountain by Laura Adams Armer

1935 -- Dobry by Monica Shannon

1940 -- Daniel Boone by James Daugherty











 
I have not read these books even though I own a copy of Waterless Mountain. Published reviews of these books are mixed. Has anyone read these books? Does anyone know why these are out-of-print? Please leave feedback