Andrew H. Reeder grants his "Power of Attorney" to John A. Halderman, who had served him faithfully in various capacities since 1854, via this notarized, handwritten document dated April 27, 1857. It specifically details what such power meant in terms of the property holdings Reeder had in Kansas Territory, etc.
Kansas Memory
Kansas Historical Society
Power of Attorney from Andrew H. Reeder to John A. Halderman - p. 2