At top right in ink: very delicate distance, perfectly graduated, - light red hills dotted with brilliant lights / Rocky Mts. Colorado / Blakelock; on slope: end of light; bottom right: 225; on verso: "Sketch Rocky Mts Colo." / 6 X 9 1/2 / R.A. Blakelock, N.A. / No. 1375.
Maxim Karolik, Newport; Gift to MFA April 11, 1957
Gift of Maxim Karolik for the M. and M. Karolik Collection of American Watercolors and Drawings, 1800–1875