Micro contaminants in surface sediments and macrobenthic invertebrates of the North Sea / J.M. Everaarts, C.V. FischerNormering van mariene sedimenten : relatie tussen concentraties in Nephtys hombergii en sediment / J.M. Everaarts, R.J. DiependaalThe haemoglobin of the herring, Clupea harengus / [by] Jan Meindert Everaarts