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:
Hessel. en Some of Hessel's drawings from which were reproduced in My private collection Jnl chemist PDold Geologists from Germany establishments births Alumni of the University of Heidelberg Educational institutions established in the th century Mineralogists from Germany University of Marburg faculty deaths Location not applicable