Nielsen, Jens, 1931- How to save or make thousands when you buy or sell your house, [electronic resource] / by Jens and Jackie Nielsen. Illustrated by Ron Duckwitz. Edited by Mary Lyon.. — Garden City, N.Y., : Doubleday, [1974, c1971]. — xii, 175 p. : illus. 26 cm. — (Dolphin books,) C504.