Our Wonder World: A Library of Knowledge

Our Wonder World was a children's encyclopedia published from the 1910s to the mid-1960s, under a variety of names.

The original series was published in 10 volumes by the Chicago-based G. L. Schuman and Company. The series did not have named editors until at least 1926, when Howard Bristol Grose was credited as editor. The series included an 11th supplementary volume in at least the 1921 and 1926 editions. This edition was topically arranged, rather than alphabetical, designed for browsing rather than direct reference. It also contained "fictional as well as factual information."

(https://en.wikipedia.org/wiki/Our_Wonder_World)