Map Of Eastern Kansas By E.B. Whitman & A.D. Searl, General Land Agents Lawrence, Kansas 1856. Boston, Published by J.P Jewett and Co. Entered ... 1856 by E.B. Whitman & A.D. Searl ... Mass. L.H. Bradford & Co.'s Lith, Boston. (inset map of Ft. Riley) The Geographical Centre of U.S. Possessions.