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Notes on the biology of some of our North American species of May-flies / Helen E. Murphy.

Augerius Clutius and his "De Hemerobio" : an early work on Ephemeroptera / Frans P.M. Francissen and Ad W.M. Mol ; with a preliminary remark by Armin Geus.

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Mayflies

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Notes on the biology of some of our North American species of May-flies / Helen E. Murphy.

Augerius Clutius and his "De Hemerobio" : an early work on Ephemeroptera / Frans P.M. Francissen and Ad W.M. Mol ; with a preliminary remark by Armin Geus.