The Library is an interactive building, on the outskirts of your farm near the Cooperative tree, that sells Farm Booster Handbooks to increase the yields of your produce.

The Handbooks are permanent and can be upgraded like buildings for gold.

Each upgrade of the handbook costs more gold than the previous upgrade. Handbooks can be purchased for 20% less gold during one of the Prime sales.

The Library upgrades as your Handbooks upgrade, Thank you RunsWivScissors (GB1) for these images.