Letterpress copybooks concerning affairs in Missouri and Kansas, and the operation and properties of the Leavenworth, Lawrence & Galveston Railroad of which Walker was president at the time. Many letters are addressed to J. F. Joy, Octave Chanute and to officials of the Missouri, Kansas and Texas Railroad, the Kansas Pacific line, and the Kansas City Stockyards. Volume 4 also includes a few items comprising legal opinions and some incoming correspondence.

One letterpress volume containing correspondence concerning securities, coal companies, and stockyards as well as some personal letters to artists and European friends.

These two letterpress copybooks come from the period that Walker was still acting as legal counsel to CB&Q as a member of the firm of Walker & Dexter. Volume 1 contains letters to J. F. Joy, attorneys, and local citizens concerning legal matters, as well as personal correspondence regarding family and estate matters. Volume 2 contains legal writings.