na INLIS000000000008373 20240221083506 0010-0521008373 240221 | | 0-408-70924-3 en 591.16/CON2 591.16/CON2 CRIGHTON, D.B. CONTROL of ovulation / CRIGHTON, D.B. London : Butterworths, 1978 492 p.: ill,; 23 cm.