http://pec.lib.wvu.edu/record/P180291887Catalogue and price-list of Keuffel & Esser Co., manufacturers and importers of drawing materials and surveying instruments.Serial. Printed Ephemera Collection has: 20th ed. (1887).Keuffel and Esser Company.Keuffel and Esser Company--Catalogs.Drawing materials--Catalogs.14256