Additional DC-3/C-47 Manuals:
Take your time and get to know the DC-3/C-47...I can recommend reading information regarding the aircraft "general" systems/systems operations and deeper into flying techniques and performance/limitations.
Here is a very good resource for Flight Operating Instructions and Manuals for the DC-3/C-47. It called "https://www.avialogs.com/" and it is a "treasure" for Aviation enthusiasts. You will find these, among other useful materials:
Read these documentation online is free. There is an embedded reading window with comfortable pages view settings (screenshot attached below):
AVIALOGS C-47 Manuals: https://www.avialogs.com/search-results?view=results&word=Yy00Nw
AVIALOGS DC-3 Manuals: https://www.avialogs.com/search-results?view=results&word=ZGMtMw