00704nam a22001817a 4500003000800000005001700008008004100025040002100066082001600087100001900103245012300122260005200245300003400297490003700331504005100368650004700419650005600466BD-DhUL20141223100552.0141223s1965    -uka|||| |||| 001 0 eng d  aBD-DhULcBD-DhUL  a587.31bCOF  aCob, boughton.  aA field guide to the ferns :band their related families of northestern and central north america /cby Boughton Cobb.  aCambridge :bBoughton mifflin company, cc1956.  axviii, 281p. :bill. ;c19cm.  athe peterson field guide series.  aincludes bibliographical references and index.  aFerns -- North America -- Identification.   aFougères -- Amérique du Nord -- Identification.