Handwritten letters of introduction prepared for Robert Ridgway by Spencer Baird to Whom it may concern, May 8, 1867. Letter includes a sheet of paper entitled "Persons to whom Mr. Ridgway is especially recommended."
Handwritten incoming correspondence to Robert Ridgway from Spencer Baird, June 22, 1869. To Ridgway in Salt Lake City, Utah. It discussed Utah specimens that Ridgway had sent to Baird and ones that he was to collect.
Letters of introduction prepared for Robert Ridgway by Spencer Baird to Samuel Hubbard, May 8, 1867. The letter asked Hubbard to assist Ridgway in preparing for his upcoming trip, with Clarence King, to the West.