"How to Write and Speak Effective English", by Edward Frank Allen. Published 1938 by World Syndicate Publishing Co. Hardback. 329 pages, no dust jacket. Good condition -- would be very good for a book this age if not for some scribbling on the endpapers.
Lovers of language might get a glimpse of what has and hasn't changed in English usage over the past 70 years from this volume. An interesting sample of Depression-era writing.