This calendar art print shows a cowboy watering his string at a cool mountain stream below a majestic canyon wall.

Printed on the front: Below the Canyon Wall - Painted by Olaf Wieghorst

Sizes I have found:
9 x 12 inches

From a 1954 painting titled: “Watering the Horses at Shafta”
Oil on canvas, 28 x 38 inches