906 resultados para Fresh Water

(Table 2) Percentage of fresh water in the surface water layer of the Arctic Ocean at Stations NP-1969-16-A and NP-1969-17-A

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A guide to the study of fresh-water biology, with special reference to aquatic insects and other invertebrate animals and phyto-plankton, by James G. Needham and Paul R. Needham.

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Report on the fresh water fish and fisheries of India and Burma / by Francis Day.

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Fresh-water rhizopods of North America.

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Text

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Monography of the family Unionidae, or Naiades of Lamarck (fresh water bivalve shells,) of North America, : illustrated by figures drawn on stone from nature. / by T.A. Conrad ...

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1

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Permo-Carboniferous fresh water burrows / Everett C. Olson -- and Kathryn Bolles --.

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v.33:no.15(1975)

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How to know the fresh-water algae; an illustrated key for identifying the more common fresh-water algae to genus, with hundreds of species named pictured and with numerous aids for their study.

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A popular history of British sea-weeds, comprising their structure, fructification, specific characters, arrangement, and general distribution, with notices of some of the fresh-water Algae. By the Rev. D. Landsborough ...

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The life of inland waters; an elementary textbook of fresh-water biology for students, by James G. Needham and J. T. Lloyd.

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Field book of ponds and streams; an introduction to the life of fresh water, by Ann Haven Morgan ... with about 330 illustrations, including 23 plates in color and black and white.

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Report drawn up on behalf of the Committee on the Environment, Public Health and Consumer Protection on the proposal from the Commission of the European Communities to the Council (COM(85) 605 final- Doc. C 2-138/85) for a decision amending Decision 77/795/EEC establishing a common procedure for the exchange of information on the quality of surface fresh water in the Community (COM(85) 605 final - Doc. C 2-138/85). Working Documents 1985-86, Document A 2-221/85, 18 February 1986.

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Communication from the Commission to the Council relative to negotiations with a view to concluding a European Convention on the protection of fresh water against pollution. SEC (74) 1564 final, 26 April 1974

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Ocean and river gardens : a history of the marine and fresh-water aquaria, with the best methods for their establishment and preservation ...

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Pt. II has title: River gardens; being an account of the best methods of cultivating fresh water plants in aquaria.

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Fresh water-salt water density currents : a major cause of siltation in estuaries /

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"April 1957."

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Insect food of fresh-water fishes /

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"Reprinted from the Fourth annual report of the Commission of Conservation"

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