Rudolf Mell 1922 paper - Good old days
This paper is about mammals and birds in Guangdong around the 1920s. In German.
Map: "illustration" in the index page
http://www.biodiversitylibrary.org/item/37050#page/11/mode/1up
Content
http://www.biodiversitylibrary.org/page/13203420#page/49/mode/1up
Birds: from page 40