December 1939 Science and Discovery Magazine

August 1939 Science and Discovery Magazine

Popular Science Monthly Mechanics & Handicraft Magazine, January 1940

October 1939 Science and Discovery Magazine

1940 Kemkit Scientific Corp Catalog & Price list Illustrated

Vintage 1940 Practice of Medicine , Meakins 3rd Edition - !32 - 10C

Planning My Book Scientific-Technical-Mathematical 1940 Writer's Reference Book

1940 HUMPHREYS’ MANUAL On the Care and Treatment of Ailments Which May be Treat