ALEXANDER BROOK (American, b. 1898); RALPH DUBIN (American, 20th Century) and JOHN EDWARD HELIKER (American, b.1909), House; Rooftops, Provincetown No. 2; Abstract Plan and Blue Hill: Four works, the first, signed--pencil on paper; the second, signed--ink wash on paper; the third, signed--crayon, pen and ink and ink wash on brown paper; the fourth, signed--oil on canvas--26¾ x 21½ in. (68 x 52.1 cm.) and smaller Four (4)