The Siegel-Cooper Company was a discount department store that sold books on its imprint between the early 1890's and early 1900's. The first store was located on State Street in the Chicago Loop. The top Rollo book has the same format as a book published by E. A. Lawson. The bottom book has the same format as a pre-1902 Mershon Company publisher's series format. These Rollo books are part of large publisher's series. They are 6 x 4.5.