Most of the volumes of the series """"Subwasserflora von Mitteleuropa"""" are written in German language, the volumes 2/1 - 2/4 dealing with the Bacillariophyceae (diatoms) as well. This title presents all the dichotom keys from the Bacillariophyceae - volumes 2/1 - 2/4 in English and French translation.