What books were published in the 1930s?

* The Pastures of Heaven (1932) * The Red Pony(1933) * To a God Unknown (1933) * Tortilla Flat(1935) * The Harvest Gypsies: On the Road to the Grapes of Wrath (1936) * In Dubious Battle (1936) * Of Mice and Men (1937) * The Long Valley (1938) * The Grapes of Wrath (1939)