I don't have reliable information about a specific work titled "Sketchbook" by Sanford Robinson Gifford in graphite. Gifford (1823-1880) was a prominent Hudson River School painter known primarily for his luminous landscape paintings in oil, and while he certainly created graphite sketches as studies, I cannot verify details about this particular work without risking inaccuracy. If you have additional information about this artwork such as its date or current location, I would be better able to provide accurate commentary.