Nygaard, G. - Hydrobiological Studies on Some Danish Ponds and Lakes. Pt. II: The Quotient Hypothesis and Some New or Little Known Phytoplankton Organisms

Ejnar Munksgaard 1949 293, 126 text figs, 4 tables (2 folding). . HB. 4to, nicely bound in buckram, gt title to spine. Vg.. Scarce. Text English. Det Kongelige Danske Videnskabernes Selskab, Biologiske Skrifter, Bd. VII, nr. 1..

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