Edward Knobel (Knobel, Edward)

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  Field Guide to the Grasses, Sedges and Rushes of the United States
  by Edward Knobel, Mildred Elizabeth Faust
  Softcover, Dover Pubns, ISBN 048623505X (0-486-23505-X)
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  Identify Trees and Shrubs by Their Leaves: A Guide to Trees and Shrubs Native to the Northeast
  by Edward Knobel
  Softcover, Dover Pubns, ISBN 0486228967 (0-486-22896-7)