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
The Handbooks are permanent and can be upgraded like
buildings for gold.
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.
Library upgrades as your Handbooks upgrade, Thank you RunsWivScissors