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Van Vleck, John Hasbrouck

(Encyclopedia) Van Vleck, John Hasbrouck, 1899–1980, American physicist, b. Middletown, Conn., Ph.D. Harvard, 1922. As a professor at Harvard, Van Vleck developed fundamental theories on the quantum…

Helst, Bartholomeus van der

(Encyclopedia) Helst, Bartholomeus van derHelst, Bartholomeus van derbärˌtōlōmāˈəs vän dər hĕlst [key], 1613–70, Dutch portrait painter. In Amsterdam the wealthy citizens preferred his flattering,…