Sirvi Autor "Timm, Tarmo (Leg.)" järgi

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Lake Peipsi 1970 (Phytoplankton samples)
(1970) Timm, Tarmo (Leg.); Pork, Maia (Leg.); Laugaste, Reet (Det.); Eesti Maaülikool. Loodusteaduslikud kogud
Method: Up to 1988 the samples were preserved with formaldehyde (not neutralised), and lots of samples were spoiled: sample sediment was flaked, stuck together, or rusty. By this reason, a number of results of countings are not representative.