Mallon, John. Opening leads and signals. [electronic resource] . — New York, : Collier Books, [c1964,1969]. — 158 p. : illus. 18 cm. LCCN: 64018207 Nat. Bib. No.: GB70-11255 Subjects--Topical Terms: Contract bridge. LC Class. No.: GV1282.3 Dewey Class. No.: 795.41/53