00506nam a22001817a 45000050016000000100014000160200026000300350013000560370013000690820012000821000020000942450055001142600075001692700018002443000029002626500016002916500017003072010080509129.0  aENG-98347  a9788190905589c150.00  aEN-81880  bDBAD/PUB  a585.012  aChinnapappu, P.  aPteridophytes and gymnosperms /cby P. Chinnapappu  aSalembSreerengayammal Memorial Educational and Charitable Trustc2009  bSaleme636006  a133p. :billc20cm (pbk)  aGymnosperms  aPteridophyta