Bibliography

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Gates FC, Ehlers JH.  1948.  Additions to an annotated list of the higher plants of the region of Douglas Lake, Michigan. III. Papers of the Michigan Academy of Science, Arts and Letters. 32:27-46.
Gates FC, Ehlers JH.  1927.  Additions to an annotated list of the higher plants of the region of Douglas Lake, Michigan. Papers of the Michigan Academy of Science, Arts and Letters. 8:111-120.
Gates FC, Ehlers JH.  1931.  Additions to an annotated list of the higher plants of the region of Douglas Lake, Michigan. II. Papers of the Michigan Academy of Science, Arts and Letters. 13:67-88.
Gates FC, Ehlers JH.  1925.  An annotated list of the higher plants of the region of Douglas Lake, Michigan. Papers of the Michigan Academy of Science, Arts and Letters. 4:183-284.