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With the addition of formations to 7th and the release of the new ork codex and supplement, formations have caught my eye. This is something that I never really paid much attention to before and seems like a fun way to build your army around the fluff without giving up the competitiveness of your army.

Can we make a list of all formations and where to find them?

I would start but I dont have my ork dex with me.

Mostly all of them can be found in Black Library, Apocalypse books and in the newer codexes.

To help you:

http://www.blacklibrary.com/games-workshop-digital-editions/Dataslates