920 resultados para Tourists -- Moral and ethical aspects -- North America

Monographs on the Isopods of North America / by Harriet Richards.

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The birds of eastern North America : known to occur east of the ninetieth meridian / by Charles B. Cory.

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The butterfly book; a popular guide to a knowledge of the butterflies of North America,

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The hawk moths of North America.

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Catalogue of the described Lepidoptera of North America. Prepared for the Smithsonian Institution / By John G. Morris.

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The green Algae of North America, [by Frank S. Collins]

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The North American slime-moulds; being a list of all species of Myxomycetes hitherto described from North America, including Central America, by Thomas H. Macbride ...

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Synopsis of the neuroptera of North America. With a list of the South American species. Prepared for the Smithsonian institution by Hermann Hagen.

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Monographs of the Diptera of North America. Prepared for the Smithsonian Institution.

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Catalogue of the described Diptera of North America. By C. R. Osten-Sacken.

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Entomology, with special reference to its biological and economic aspects.

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Catalogue of the described Diptera of North America. Prepared for the Smithsonian institution by R. Osten Sacken.

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Monography of the family Unionidæ, or, Naiades of Lamarck (fresh water bivalve shells) of North America ... By T. A. Conrad.

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Polyhedral and combinatorial aspects in optimization

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Magdeburg, Univ., Fak. für Mathematik, Habil.-Schr., 2012

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Contributions to North American Euphorbiaceae-- v: 1. "Euphorbia adenoptera" in North America. 2. Chamaesyceae novae. 3. Notulae hypericifoliaearum. By Charles Frederick Millspaugh.

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v.2:no.10(1914)

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