Celtic Cross headstone by Tiffany, A.C. McClurg, publisher of Tarzan, Du...

General Alexander C. McClurg (G.A.R.)
Graceland Cemetery, Chicago
Celtic Cross by Louis Comfort Tiffany

A.C. McClurg & Co. traces its origins to Chicago's oldest book and stationery store which was founded in 1844. The young Alexander C. McClurg went to work for the company, then known as S. C. Griggs, in 1859. McClurg resumed working for Griggs after returning from the Civil War with the rank of general. When the firm's premises were destroyed by fire in 1899, General McClurg decided to reorganize as a corporation with shares sold to employees. He died soon thereafter in 1901. Little publishing took place until 1914 when the firm negotiated what turned out to be its most profitable publication, Tarzan of the Apes by Edgar Rice Burroughs. McClurg & Co. went on to publish 10 more Tarzan titles. Eventually Burroughs set up his own company to deal with all iterations of his famous character.

Most authors who published with McClurg are fairly unknown, but some of the better-known authors include Felix Borowski (Standard Concert Guide/Standard Opera Guide), Edgar Rice Burroughs, Mary Hartwell Catherwood, W. E. B. Du Bois, Byron A. Dunn, Oscar J. Friend, Zane Grey, Edith Ogden Harrison, Margaret Hill McCarter, and Clarence E. Mulford, author of the Hopalong Cassidy books.
http://www.newberry.org/collections/FindingAids/mcclurg/McClurg.html