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  1. Annelids, parasitic worms, Protozoans, etc. Part A Oligochaeta.
    By: Smith, Frank, - Welch, Paul S. - Canadian Arctic Expedition
    Publication info: Ottawa :J. de L. Taché,1919.
    Contributed by: Canadiana.org (archive.org)
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  2. Oligochaeta collected in Greenland by the Crocker Land Expedition. Bulletin of the AMNH ; v. 44, article 14.
    By: Crocker Land Expedition (1913-1917) - Tanquary, Maurice Cole, 1881- - Welch, Paul S.
    Publication info: New York : Published by order of the Trustees, American Museum of Natural History 1921
    Contributed by: American Museum of Natural History Library
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  3. Papers from the Peter Redpath Museum No. 1. Organisms and organization /
    By: Willey, Arthur, - Welch, Paul S.
    Publication info: Montreal :[s.n.],1917.
    Contributed by: Canadiana.org (archive.org)
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  4. Zoology; a text-book for universities, colleges and normal schools,
    By: Galloway, Thomas Walton, - Welch, Paul S.
    Edition: 4th ed., rev., with 255 illustrations.
    Publication info: Philadelphia,P. Blakiston's son & co.[c1922]
    Contributed by: Library of Congress
    BHL Collections: Library of Congress
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  5. Zoology; a text-book for universities, colleges and normal schools,
    By: Galloway, Thomas Walton, - Welch, Paul S.
    Edition: 4th ed., rev., with 255 illustrations.
    Publication info: Philadelphia,P. Blakiston's son & co.[c1922]
    Contributed by: Cornell University Library
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  1. BIFURCATION IN THE EMBRYOS OF TUBIFEX
    By: Welch, Paul S. (Paul Smith), 1822-1959
    Type: Article
    In: Biol Bull
    Volume: 41
    Date: 1921-10-01
    Page Range: 188--202
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  2. Entomological Abstracts
    By: Welch, Paul S. (Paul Smith), 1822-1959
    Type: Article
    In: Transactions of The American Microscopical Society
    Volume: 38
    Date: 1919
    Page Range: 292--294
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  3. Entomological Abstracts
    By: Welch, Paul S. (Paul Smith), 1822-1959
    Type: Article
    In: Transactions of The American Microscopical Society
    Volume: 39
    Date: 1920
    Page Range: 163--166
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  4. Entomological Notes
    By: Welch, Paul S. (Paul Smith), 1822-1959
    Type: Article
    In: Transactions of The American Microscopical Society
    Volume: 35
    Date: 1916
    Page Range: 257--268
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  5. Entomological Notes
    By: Welch, Paul S. (Paul Smith), 1822-1959
    Type: Article
    In: Transactions of The American Microscopical Society
    Volume: 35
    Date: 1916
    Page Range: 141--148
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  6. Entomological Notes
    By: Welch, Paul S. (Paul Smith), 1822-1959
    Type: Article
    In: Transactions of The American Microscopical Society
    Volume: 35
    Date: 1916
    Page Range: 65--73
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  7. Further Studies on North American Mesenchytraeids (Oligochaeta)
    By: Welch, Paul S. (Paul Smith), 1822-1959
    Type: Article
    In: Transactions of The American Microscopical Society
    Volume: 38
    Date: 1919
    Page Range: 175--188
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  8. The Genera of the Enchytraeidae (Oligochaeta)
    By: Welch, Paul S. (Paul Smith), 1822-1959
    Type: Article
    In: Transactions of The American Microscopical Society
    Volume: 39
    Date: 1920
    Page Range: 25--50
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  9. Observations on the life history of a new species of Psychoda
    By: Welch, Paul S. (Paul Smith), 1822-1959
    Type: Article
    In: Ann. Ent. Soc. Am
    Volume: 5
    Date: 1912
    Page Range: 411--418
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  10. Snow-Field and Glacier Oligochæta from Mt. Rainier, Washington
    By: Welch, Paul S. (Paul Smith), 1822-1959
    Type: Article
    In: Transactions of The American Microscopical Society
    Volume: 35
    Date: 1916
    Page Range: 85--124
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  11. Studies on a Phosphorescent Bermudan Annelid, Odontosyllis Enopla Verrill
    By: Galloway , T W - Welch, Paul S. (Paul Smith), 1822-1959
    Type: Article
    In: Transactions of The American Microscopical Society
    Volume: 30
    Date: 1911
    Page Range: 13--39
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