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Authors:
Samuel W. (Samuel Wendell) Williston
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Contribution to a Monograph of the North American Syrphidae [microform] — Samuel W. (Samuel Wendell) Williston
![Contribution to a Monograph of the North American Syrphidae [microform] — Samuel W. (Samuel Wendell) Williston](https://en.touchelivros.com.br/wp-content/uploads/2026/03/contribution-to-a-monograph-of-the-north-american-syrphidae-microform-samuel-w-samuel-wendell-williston-jpg.jpg)
