Annelids, Parasitic Worms, Protozoans, etc. Part A [microform]Frank 1857-1942 Smith, Paul S. (Paul Smith) 1882-1959 Welch, Canadian Arctic Expedition (1913-1918) · First published 2021Open the Tome
Zoology; A Text-Book for Universities, Colleges and Normal SchoolsPaul Smith Welch, Thomas Walton Galloway · First published 2018Open the Tome
Culture methods for invertebrate animalsPaul Simon Galtsoff, Frank Eugene Lutz, Needham, James G., Paul Smith Welch · First published 1937Open the Tome
Oligochaeta collected in Greenland by the Croker Land ExpeditionPaul Smith Welch · First published 1921AdventureOpen the Tome
Studies on the Enchytræidæ of North AmericaPaul Smith Welch, Illinois State Laboratory of Natural History · First published 1914Open the Tome
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