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Forsuring

Published 13. november 2017 at 3920 × 4411 in Forsuring.
© 2013 Steen Ulnits - Fisheries biologist, M.Sc. - Skytten 116, Fiskergaarden - DK-8920 Randers NV - Denmark - tel.: 23 32 89 88 - e-mail: steen@ulnits.dk