All blueprints that you obtained are also put into your inventory. Here you can see the progress on the collections for the different Great Buildings and enter the construction menu. There you can buy missing blueprints with Diamonds, trade in duplicate blueprints and pay the goods costs to finally construct your Great Building once you complete a collection.
[[File:Blueprintsinventory.jpg]]
Zmiany – Forge of Empires - Wiki PL

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