The conflict between Noah Webster and Joseph Emerson Worcester, and their dictionaries came to be known as the Dictionary Wars. To set the scene, part one covers the biographies of the two men.
Research:

Robert Moses and the Shaping of New York, Part 2
42:12

Robert Moses and the Shaping of New York, Part 1
41:59

SYMHC Classics: Eradication of Smallpox
43:25