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By "Zippi, P. A."
Extraction of zygnematacean zygospores from lake sediments and their potential as paleo-indicators of lake acidification : R.A.C. Project No. 464G / prepared for Environment Ontario by P.A. Zippi ... [et al.].
By: Zippi, P. A. - Ontario Water Resources Commission. - Ontario.
Publication info: [Toronto] :Environment Ontario,1991.
Contributed by: Ontario Ministry of the Environment (archive.org)