Reddit reviews Legend of Korra: The Art of the Animated Series Book Two: Spirits

https://www.amazon.com/Legend-Korra-Animated-Book-Spirits/dp/1616554622

ATLA Book 1-3, LOK B1, LOK B2, LOK B3.

LOK B4 isn't out yet.

I'm not positive either, but I listed all the ATLA books that I know of below. Some aren't comics, but I'm not sure if you're just referring to the Gene Luen Yang collab comics or the others as well.

Post A:TLA Universe Comics: By Gene Luen Yang

The Promise

Part 1

Part 2

Part 3

The Search

Part 1

Part 2

Part 3

The Rift

Part 1

Part 2

Part 3


Artwork and Development

These aren't comics, but I added them because they're awesome.

Avatar: The Last Airbender, Art of the Animated Series

The Legend of Korra: The Art of the Animated Series Book One - Air

Legend of Korra: The Art of the Animated Series Book Two

Other Comics

The Lost Adventures

There are also The Earth Kingdom Chronicles series, The Lost Scrolls Collection and The Tale of Aang/Zuko, but I'm not sure if they're canon (I am guessing they are since there's a Nickelodeon logo on them, but the original creators/writers aren't listed among the author so I don't know).

It was added to Amazon a few days ago. You should be able to find it just by searching.

Here is a link if you want it (It's an Amazon smile link that provides a little money to Saint Jude Children's Research Hospital if that is alright and allowed):

http://smile.amazon.com/dp/1616554622/ref=wl_it_dp_o_pd_nS_ttl?_encoding=UTF8&colid=1PVKINSI4Z0W&coliid=I2FMRGQJUN8R8L