Letter to the EditorReplyAuthors: Herbert RiehlEmail Herbert RiehlToggle author information panelHerbert Riehl, University of Chicago, United StatesYear: 1953Volume: 5 Issue: 3Page/Article: 317-318DOI: 10.3402/tellusa.v5i3.8586Published on 1 Jan 1953Peer ReviewedCC Attribution 4.0