"The scene represented is a gorge in the vicinity of the Rocky Mountains, at the bottom the water is coming down in cascades caused by the melting snows above and forms one of the numerous feeders to the mighty Missouri. The defile is comparatively so narrow that the sun only penetrates it at mid-day. To the left, under some wild cliffs, Trappers are building a cache, out-of-the-way and secluded places are selected for this purpose in order to escape the eyes of prying Inidans. If the gound has a sod, it is carefully cut and placed to one side, a hole is then dug of sufficient capacity to contain all such articles as are to be deposited." A.J. Miller, extracted from "The West of Alfred Jacob Miller" (1837).
In July 1858 William T. Walters commissioned 200 watercolors at twelve dollars apiece from Baltimore born artist Alfred Jacob Miller. These paintings were each accompanied by a descriptive text, and were delivered in installments over the next twenty-one months and ultimately were bound in three albums. Transcriptions of field-sketches drawn during the 1837 expedition that Miller had undertaken to the annual fur-trader's rendezvous in the Green River Valley (in what is now western Wyoming), these watercolors are a unique record of the closing years of the western fur trade.