MSS 4 appearance of LANDSAT scene of August 7, 1975, 
showing mass occurrence of blue green algae in the Baltic 
sea between the Danish Bornholm in the north and the GDR 
in the south. 
  
Fig. 6: MSS 6 presentation of lower part of fig. 5, pointing out 
"clouds in the Oder estuary in the Haff on August 7, 1975.