There are two books.. Both are much alike but very minor differences. I can not recommend one over the other but pick one
The RV Owner's handbook
THe RV Book
THen for every appliance Stove, Fridge, Microwave, Water pump, Converter, Fans, in fact even mirrors windows doors counter tops and floors (Steps too) if you can identify the make and model download the PDF from the manufacturer's web site to your hard drive.
Google is your friend.. Example Google: Dometic Model 1124321092 Refrigerator Manual.