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  1. Apple tree insects of Maine.
    By: Patch, Edith M. - Johannsen, O. A. - Maine Agricultural Experiment Station.
    Publication info: Orono,1910
    Contributed by: Library of Congress
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  2. Aquatic insects in New York state ; a study conducted at the entomologic field station, Ithaca, N. Y. under the direction of Ephraim Porter Felt.
    By: Needham, James G. - Davis, Kary Cadmus, - Johannsen, O. A. - MacGillivray, Alexander Dyer,
    Publication info: Albany,University of the state of New York,1903.
    Contributed by: Cornell University Library
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  3. Aquatic nematocerous diptera. (I)
    By: Johannsen, O. A.
    Publication info: Albany :University of the State of New York,1903.
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Institution Libraries
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  4. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching, by Oskar A. Johannsen ... and Ferdinand H. Butt ...
    By: Johannsen, O. A. - Butt, Ferdinand Hinckley,
    Edition: 1st ed.
    Publication info: New York,McGraw-Hill Book Company, inc.,1941.
    Contributed by: MBLWHOI Library, Woods Hole
    BHL Collections: MBLWHOI Library, Woods Hole
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  5. Genera of plancton organisms of the Cayuga lake basin / [by O.A. Johannsen and J.T. Lloyd].
    By: Johannsen, O. A. - Lloyd, J. T.
    Publication info: Ithaca, N.Y. :Limnological Laboratory of the Dept. of Entomology in Cornell University,1915.
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Institution Libraries
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  6. Guide to the insects of Connecticut.
    By: Johannsen, O. A. - State Geological and Natural History Survey of Connecticut.
    Publication info: Hartford :Geological and Natural History Survey,1911-
    Contributed by: Earth Sciences - University of Toronto (archive.org)
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  7. Handbook of medical entomology [by] Wm. A. Riley ... and O. A. Johannsen.
    By: Riley, William Albert, - Johannsen, O. A.
    Publication info: Ithaca, N. Y.,The Comstock publishing company,1915.
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Institution Libraries
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  8. Handbook of medical entomology / Wm. A. Riley and O.A. Johannsen.
    By: Riley, William A. - Johannsen, O. A.
    Publication info: Ithaca, N.Y. :Comstock Pub. Co.,1915.
    Contributed by: University of California Libraries (archive.org)
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  9. May flies and midges of New York. Third report on aquatic insects. A study conducted at the entomologic field station, Ithaca, N. Y., under the direction of Ephraim Porter Felt. By James G. Needham, Kenneth J. Morton [and] O. A. Johannsen.
    By: Needham, James G. - Felt, Ephraim Porter, - Johannsen, O. A. - Morton, Kenneth J.,
    Publication info: Albany,New York State Education Department,1905.
    Contributed by: University of California Libraries (archive.org)
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  10. May flies and midges of New York. Third report on aquatic insects. A study conducted at the entomologic field station, Ithaca, N.Y., under the direction of Ephraim Porter Felt. By James G. Needham, Kenneth J. Morton [and] O.A. Johannsen.
    By: Needham, James G. - Felt, Ephraim Porter, - Johannsen, O. A. - Morton, Kenneth J.
    Publication info: Albany,New York State Education Dept.,1905.
    Contributed by: MBLWHOI Library, Woods Hole
    BHL Collections: MBLWHOI Library, Woods Hole
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