Calculus of Variations and Partial Differential Equations of the First Order, Pa

Partial Differential Equations Fritz John 1982 Fourth Edition Applied

Lectures on Partial Differential Equations of First Order

Integral Equations, Calculus of Variations: A Course in Mathematical Analysis...

Handbook of Calculus, Difference and Differential Equations- Edward Cogan - 1958

Differential Equations Shepley L. Ross 1964 First Edition Math Textbook Xerox

Partial Differential Equations by Lawrence C. Evans

Integral Calculus for Beginners by Joseph Edwards (Paperback)