File:Ludwig Frey charts - original.png

Summary
Three charts featured in the appendix of Ludwig Frey's book "Die Männer des Rätsels und der Paragraph 175 des Deutschen Reichsstrafgesetzbuches" ("The Men of Riddles and Paragraph 175 of the German Imperial Criminal Code") from 1898. Most notably for this project, the middle chart depicts a scale of the gender (identity) positions of Uranians.

As this is sourced from a book from 1898, it falls under the public domain. The original sources of the charts can be found here: https://books.google.com/books?id=JVbgAAAAMAAJ&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false