PT - JOURNAL ARTICLE AU - H. F. V. Riddle TI - JOINT CERTIFICATE ON CONTRACEPTION DP - 1974 May 01 TA - The Journal of the Royal College of General Practitioners PG - 350--351 VI - 24 IP - 142 4099 - http://bjgp.org/content/24/142/350.2.short 4100 - http://bjgp.org/content/24/142/350.2.full SO - J R Coll Gen Pract1974 May 01; 24