Matemātika

Differential equations and boundary value problems

C. H. Edwards

Integral Methods in Science and Engineering

Christian Constanda

A pictorial history of the Negro in America

Langston Hughes

Elementary differential equations

William E. Boyce

Differential equations

James R. Brannan

A Treatise on Differential Equations

George Boole

Fundamentals of differential equations

R. Kent Nagle

A treatise on differential equations

George Boole

Cours d'analyse mathématique

Edouard Goursat

Elementary differential equations and boundary value problems

William E. Boyce