First oil sketch for The Picnic  1979

First Oil Sketch for Sunday Morning II  1975

First Study for the President Factory  2002

First Study for The Arrow Carriers  1978

First Study for on the Wharf, Livorno  2001

Panel of Studies for Autobahn in the Black Forest  1979

Study for Jacob Descending  1979

Study for The Bus Stop  2009

Study for the Yellow Truck 

Study for Waiting for the Train  1969

Study for the Reservoir, Centennial Park  1989