This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Correspondence Butler George and Engelmann George Feb BHL. Correspondence Butler George and Engelmann George Feb Text Illustration Butler to Engelmann biodiversitylibrary org Butler Permission to digitize granted by rights holder Biodiversity Heritage Library Check categories October PDold Correspondence Butler George