00394nam a2200121 a 4500020001500000050001200015245006500027260010700092300002400199650002900223942000700252999001300259  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.  cBK  c776d776