New York: Henry Holt and Company, 1920.
First American edition. (Dated 1920 on title page with matching date on copyright page.) xiii, , 168 pp. Dark navy ribbed cloth with gilt lettering on front board, green on spine. Very Good+ with former owner's info on paste down, foxing to endpapers, offsetting to gutters. A nice copy of the groundbreaking first US appearance of Einstein's theories for a general audience. Item #140937839