A thomsonite-lintonite nodule from Grand Marais, Minnesota. From the Richard Hauck collection. Photograph by Wikimedia Commons user Robert M. Lavinsky before March 2010, CC BY-SA 3.0.
Egekvist Bakery store clerks Helen Broberg (left), Marian Lawrence (center), and Elvera Dahl (right), 1936. From the Minneapolis Newspaper Photograph Collection, Hennepin County Library Special Collections.
Three-M-ite sample collection, 1935. 3M’s first profitable product was Three-M-ite, a flexible sandpaper. Here, Three-M-ite was packaged as a sample so prospective buyers could see the product.