00350nam a2200097 a 4500020001500000050001200015245006500027260010700092300002400199650002900223  a924154241100aRG136.500aNatural family planning :ba guide to provision of services.  aGeneva :bWorld Health Organization ;aAlbany, NY :bWHO Publications Center USA [distributor],c1982.  avi, 82 p. :bill. ; 0aNatural family planning.