First Ladies: A Biographical Dictionary, by Dorothy Schneider and Carl J. Schneider, pages 220-229.
I checked this book out from the library specifically to read the section on Lou Henry Hoover, so this review will focus on that chapter.
This book was concise and well written. While I wish for more details, I realize there is not room enough for a book of this scope, covering the basics of the lives of all the first ladies.
I was particularly impressed with how ahead of her time Lou Henry Hoover was. She helped many, worked for many charitable causes, researched and embraced the different cultures she lived in and learned their languages, and kept up a level of academic thinking throughout her life. In their home, all were welcome, even when they lived in the White House. Lou and her husband "chose their friends for their interest, not their rank, and they loved having guests." She kept things casual and low-key. She promoted American products in her efforts to help with the effects of the Great Depression, and would wear cotton gowns. Additionally, even before the Depression, she dressed in a subdued manner, "expensively, preferring simple, well-made clothes but leaning towards somber colors." As a child, she embraced and enjoyed the outdoor life, which her father passed on as a legacy. She enjoyed camping, hunting, horseback riding, fishing, and many other activities and things outdoors. Her love of nature spurred her interest in geology, which is the department she studied while she was at Stanford (she met her husband in the same department). She was the only female in her area of studies, and she stood her ground. Later in life, her love of the outdoors would serve her well as she became very involved in programs for women students in sports, amateur athletics for girls and women, the Girl Scouts, and the National Women's Athletic Association.
Lou and Herbert Hoover were heavily involved helping alleviate hunger during WWI, at home and abroad. They also worked to provide relief during WWII. After her death, she left thousands of dollars of uncashed checks sent to her in payment of personal loans. She was truly a compassionate woman.