Numerical Methods for Partial Differential Equations by William F. Ames

Introduction to Partial Differential Equations by Don Greenspan (1961 hardcover)

Partial Differential Equations for Scientists and Engineers

Finite-Difference Methods for Partial Differential Equations by Forsythe Wasow

Applied Differential Equations by Spiegel 2nd Ed 1967 OLD VINTAGE MATH BOOK

Finite-Difference Methods Partial Differential Equations Forsythe & Wasow HC

Abstract Methods in Partial Differential Equations By Carroll, Robert W.

Partial Differential Equations Of Mathematical Physics by A.G. Webster PB 1955