From the Art Resources Transfer website:
The Distribution to Underserved Communities Library Program (D.U.C.) distributes books on contemporary art and culture to public schools, libraries, prisons, and alternative education centers nationwide, free of charge. D.U.C. books create access to the arts and literacy these institutions could not otherwise afford to acquire. To date, the D.U.C. has placed over 459,555 free books in 8,139 public institutions across the country.
For additional information, and to apply, please click here.