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• The flora of the upper Susquehanna and its tributaries.
  Author(s): Clute, Willard Nelson
• The flora of the upper Susquehanna and its tributaries
  Author(s): Clute, Willard Nelson
• The ferns and fern allies of the upper Susquehanna valley
  Author(s): Clute, Willard Nelson

• The human side of trees, wonders of the tree world.
  Author(s): Dixon, Royal. ,  Fitch, Franklin Everett
• The house fly, disease carrier an account of its dangerous activities and of the means of destroying it.
  Author(s): Howard, L. O.
• A guide to the wild flowers
  Author(s): Lounsberry, Alice. ,  Rowan, Marian Ellis Ryan