Embryonale und larvale Schale einiger Prosobranchier (Gastropoda, Mollusca) der Oosterschelde (Nordsee) Klaus Bandel OriginalPaper 01 April 1975 Pages: 3 - 22
Some notes on the algal vegetation of two brackish polders on texel (The Netherlands) P. J. G. Polderman OriginalPaper 01 April 1975 Pages: 23 - 34
Diel and annual oxygen regimes in a small lake Robert LingemanBen J. G. FlikJ. Ringelberg OriginalPaper 01 April 1975 Pages: 35 - 44
Some aspects on the role of bacteria in deep water ecosystems Th. E. Cappenberg OriginalPaper 01 April 1975 Pages: 45 - 47
Miscellanea A. L. van Berge HenegouwenC. van der VeldeL. W. G. Higler Announcement 01 April 1975 Pages: 48 - 50