Plankton investigations
Clark, R.M. (1905). Plankton investigations. Report on Fishery and Hydrographical Investigations in the North Sea and Adjacent Waters, 1902-1903. HMSO: London. 165-213 pp.
Deel van: Thompson, D'A. W. (Ed.) Report on Fishery and Hydrographical Investigations in the North Sea and Adjacent Waters. Her Majesty's Stationery Office: London, meer
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