Methods of Mathematical Physics Vol. 1 - Vintage Textbook - First English Ed.

METHODS OF HILBERT SPACES by KRZYSZTOF MAURIN (2nd Rev. Ed.)

Introduction to the Theory of Numbers by Herbert S. Zuckerman and Ivan Niven

Methods of Mathematical Physics Vol 1 David Hilbert & Richard Courant 1953

McGraw Hill Electrical Electronic Engineering Series- Radio Engineering - 1947

Methods of Mathematical - Paperback, by Courant Richard; Hilbert - Very Good

An Introduction to the Theory of Numbers, Third Edition by Niven, Zuckerman 1972

Complex Analysis for Mathematics and Engineering by Russell W. Howell