- Post Office Mural - Dover-Foxcroft METhe Dover-Foxcroft post office features this mural, "River Driving", by Barrie Barstow Greenbie (1920-1988). Greenbie was trained at the Corcoran School of Art in New York, and this was his first job. Painted in 1940, it made Greenbie possibly the youngest artist ever commissioned by the Work Projects Administration (WPA), according to a University of Massachusetts website entry on his life. However, it is more likely that the mural was painted under the auspices of the Treasury Section of Fine Arts, not the WPA.