"I Wonder How", # 540-B: The How, When, and Wherefore of Many Things Books by Milton Goldsmith c. 1939. Published by Platt & Munk Co., Inc., New York. Copyright 1939. 
Age range is from 8 to 16. Books are intended for the 'inquisitive child'. (Is there any other kind?) Answering questions such as: why snow is white, what the sun is made of, what makes the wind blow, etc. 
Dust cover is damaged but hardcover and inside pages are in good condition.