Association Of Life Insurance/ Medical Directors of America, 1946. NYBOER, Jan. EXPLORATORY ELECTROCARDIOGRAMS EXTREMITY, PRECORDIAL, ESOPHAGEAL AND DISCUSSION OF THE Q3 ELECTROCARDIOGRAM. [NY: Association Of Life Insurance/ Medical Directors of America, 1947]. 8vo., printed wraps. Signed presentation from Nyboer on the front cover: "To my friend Charles Poindexter, Jan." Also..... More