Construction Blueprint (very rare!)

Construction Blueprint (very rare!)
You are holding what appears to be a construction blueprint! It's difficult to say exactly what type of project it is for though, it needs to be studied before it will become any use whatsoever.
Category	Items
Sub Category	Miscellaneous items

Construction blueprints unlock new buildings at the Construction Sites Construction Sites.

Found

• Undepleted Zones

Uses

• Unlocks a very rare construction:
  After examining the plan, you realise that it shows precisely how to build the Very Rare Building !
  You record this new information in the construction site section.
  This project requires the Base building > Other prequisite to be build[sic] first.
• When used after all very rare sites are unlocked gives the following message:
  Your town has already unlocked all construction projects in this category!
  This object is therefore useless, so you decide to throw it away.
• When used in the world beyond
  To study the plans, head back to the relative calm of the town.

Unlocks

• Apple Tree
• ..