Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitlePROBLEM DEPARTMENT.AuthorsNyberg, J. A.PublicationSchool Science & Mathematics, 1920, Vol 20, Issue 7, p637ISSN0036-6803Publication typeArticleDOI10.1111/j.1949-8594.1920.tb07828.x