TY - JOUR AU - Allen, E V; Barker, N W; Waugh, J M TI - A PREPARATION FROM SPOILED SWEET CLOVER: [3,3′-Methylene-Bis-(4-Hydroxycoumarin)] Which Prolongs Coagulation and Prothrombin Time of the Blood: A Clinical Study JO - J Am Med Assoc IS - 13 VL - 120 PY - 1942 DO - 10.1001/jama.1942.02830480013004 SP - 1009 EP - 1015 ER -