E. F. Johnson Company Catalog. Omnigraph Catalog. Material: paper. Size: 6" x 9". Description: white cover; sketch of an omnigraph; black print: "Omnigraph, Just listen The Omnigraph will do the teaching, Known and used for twenty years, The Omnigraph MFG. Co., represented by E.F. Johnson, Waseca, Minn."; 11 pages.