00319nam a2200121 a 450000500170000002000150001708200130003210000180004524500350006326000500009830000270014863000220017520251202164126.0  a0716711095  a560bTAP  aTappan, Helen  aPaleobiology of plant protists  aSanfransciscobW.H. Freeman and companyc1980  axxi,1028 p.b23cm.cHB  aMicropaleontology