Go to h[
www.coloradorailroadmuseum.org] Then Click on "Bid Sheet" -- that has the details about how to bid and when -- the auction closes March 31.
Go to the "on-line gallery" -- each item is illustrated (not all the ones in the printed catalog are illustated) and described in some detail.
For instance, randomly selected #35 is "The First Five Years of the Railroad Era in Colorado - Minimum Bid: $20 1948, 214 pp., by E. O. Davis. 6" x 9" hardbound. An historical account of operations from June, 1867 to June, 1872 in Julesburg and Pueblo by a retired Union Pacific official. Some scuffs and wear on dust jacket."