The Media History Digital Library ( MHDL for short ) can be a great resource for teachers and students where they can lay their hands on public domain documents and books on film, radio, television, reviews and critiques of movies and many more.
To use Media History Digital Library you can either brows their collections where MHDL has already scanned more than 800,000 pages or use the search functionality to refine your query according the date or publication type.