00505nam a2200169Ia 4500001001000000003000500010008004100015010001100056040000900067082001400076100002500090245014000115260002800255300001100283650001700294700002400311Para_6151CHAP220125s1949    xx            000 0 und d  a204931  cCHAP  aPA 593 J3  aJahn, Theodore Louis  aHow to know the protozoa; a pictured key for identifying the more common fresh water... /c by Theodore Louis Jahn y Frances Floed Jahn  aDubuque, Iowa :b Brown  a236 p.  aProtozoarios  aJohn, Frances Floed