Elementary Differential Equations Third Edition

Elementary Differential Equations, 3rd Edition;

Ordinary Differential Equations and Their Solutions Murphy 1960 Van Nostrand

Elementary Differential Equations, Fourth Edition

Linear Algebra by Stoll, Robert R. And Edward T. Wong Hardcover

Differential Equations

Theory and Solution of Ordinary Differential Equations - Greenspan - HC 1960

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