This old book of the famous Kling and Horwitz is one the oldest endgamestudy books written.

Bernard Horwitz 1808-1885
 

Josef Kling 1811-1876

This scanned book was found on this website:

http://www.sh-kunstschach.eu

Thanks to Siegfried Hornecker

What a difference with what we have now as methods to show studies, create a chess book or website !