Bertsch, A

 
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Photomicrograph of a processionary caterpillar, late 1850s.
Photomicrograph of a processionary caterpillar, late 1850s.
Bee's Sting, c. 1850s.
Bee's Sting, c. 1850s.
Louse from a Domestic Cockerel, photomicrograph, c. 1850's.
Louse from a Domestic Cockerel, photomicrograph, c. 1850's.
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