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Existence theorems in partial differential equations. by Bernstein, Dorothy Lewis, Publication: Princeton, Princeton University Press, 1950 . vii, 228 p. , "Prepared for the Office of Naval Research by Engineering Research Associates, inc., under contract N6onr-240." 26 cm. Date: 1950 Availability: Items available: School of Theoretical Physics John T. Lewis Special Collection (Room 306) [519.6 BER] (1), School of Theoretical Physics Library [515.45 BER] (1),