Important note:Most links(?) in the reference does not correspond to an actual page break in the physical books, but rather to the closest linkable section of the DDB compendiums. That means that sometimes the information you might be looking for is above the section you arrive at. If you don't find what you're looking for, link to the page before and scroll down.
I made this reference by going through the DDB ToCs (and added some additional links) and looked up the corresponding page in the Core Rules.
I've updated the DMG list for readability, now there's only one reference for each individual page, and I used indents to mark which DDB sections go to a certain page. I've also used indents to try to indicate different heading levels.
And I included page references to all magic items!! :-D *pheeeeew*
Edit: I'll give the same treatment to the PHB listing, and probably revork the Spell section :-D
I've updated post #7 to clarify that these lists where made with DDB as the starting point, meaning it's a visual aid to get an approximate page number from DDB. I also changed the title of the thread to make this more clear. It's a bit counter intuative since the page numbers are listed first, but that's because of readability. I could possibly make changes for this...
Anyway, I've been busy with another project where the aim was to have a way of looking up a page number from the Core rules on DDB. To that end, I made https://ddbredirecter.com/redirecter/ which helps you look up page numbers from the Core Rules.