These are sample issues of The Jumbo, a periodical published in 1887-1888 by John and Theodore Miller under the name Miller Bros. The magazine was published as a weekly in 1887 and through March in 1888, as a monthly in April -October 1888, and again as a weekly in November-December 1888. The following issues are represented: 1887: March 19, 26, May 7; 1888: April, May, November 10, 17, 2, December 1, 7, 15.
A nearly complete set can be found on the John V. Miller Papers, Miller Family Papers, Oliver Archive Center, Chautauqua, RG III-A10-5. Courtesy of the Chautauqua Institution Archives, Oliver Archive Center