Hi, 

there is a camp database on modern chess about the Slav. 

You can get a preview here: 
https://www.modern-chess.com/understand-the-slav-defence?theme=1#article

In this database GM Papaioannou analyses many model games about the Exchange Slav. 

I don't have this camp database, but I have quite a few other camp databases 
and I think Modern Chess and GM Papaioannou have done quite a good job 
in these databases. 

By the way 
all 1.d4 - databases are now on offer (minus 60%), 
but according to my newsletters this offer will expire yesterday and they have no ticker 
which tells us how long this interesting offer will be valid. 

I have two books, one really old Exchange Slav book by Silman & Donaldson (probably really outdated at this point), and then I also have "Grandmaster Repertoire 17" on forward chess (ebook) which covers all of the Slav including the exchange slav from black's perspective. 

I can share the "Introduction" from the Silman and Donaldson book, which I think gives you a decent idea of what you're up against:

"...By creating a symmetrical position with an extra tempo, White keeps Black's counterplay to a minimum while developing positional pressure with little, if any, changes of defeat. 

"...a game between non-masters will undoubtably see Black's winning chances are no worse than any other opening. At a higher level though, a master may want to avoid this line in Swiss system tournaments against weaker competition due to the effort he will have to expend if he hopes to acquire a victory."

The more recent assessment in GM repertoire 17: "For many years the Exchange variation of the Slav was considered to be quite annoying to face, but essentially harmless. However in the last two or three years the situation has changed dramatically and now it is a very popular and fashionable choice at GM level. This is quite understandable as in most of the lines White can try to create pressure on the queenside, while facing no major risks."

In "Chess Advantage in Black and White" by Kaufman, he listed 5 criteria for a good defense, and the Slav met all criteria except one, "It must not allow White an easy route to the better side of a drawish position". He said, "..the Exchange Variation, which is rather drawish and leaves black at least marginally worse."

Now that you are sufficiently depressed I will say that the coverage in GM Repertoire 17 is great and that'd be what I think you should pick up. There's 3 chapters on Exchange Slav and 34 chapters total.