Vol. 6 No. 1-2 (1903)

Articles

• The Dragonflies (Odomata) of Illinois, with Descriptions of the Immature Stages Part I. Petaluridae, Aeschnidae, and Gomphidae

  James G. Needham, Charles A. Hart

  1-94

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• The Plankton of the Illinois River. 1894-1899, with Introductory Notes upon the Hydrography of the Illinois River and Its Basin. Part I. Quantitative Investigations and General Results.

  C. A. Kofoid

  95-629

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