Marriott, Henry J. L. Challenging ECGs/ Henry J. L. Marriott. - Philadelphia: Hanley & Belfus, 2002. - x, 494p. : ill. Includes index. ISBN: 1560535474 Subjects--Topical Terms: Electrocardiography -- methods Heart Diseases -- diagnosis National Library of Medicine Call No.: WG140 / M349c 2002