00409nam a2200157Ia 4500008004100000082001900041100001600060245003600076250000600112260004500118300000800163650002300171650001800194653002800212653001100240170901s1943    xx            000 0 und d  a582.0463bE77I  aErdtman, G. 0aIntroduction to Pollen Analysis  a1  aNew YorkbThe Ronald Press Companyc1943  a239  aBotanical sciences  aPure Sciences  aFertilization of plants  aPollen