Abstract: Systems and apparatus for manufacturing books are disclosed. An example modular signature feeder includes a frame having a base configured to enable the modular signature feeder to be removably attached to another modular signature feeder or a signature transfer assembly associated with a signature collation feeder assembly. Removably attaching the modular signature feeder assembly to another modular signature feeder or a signature transfer assembly increases a footprint of the signature collation feeder assembly. A conveyor configured to move signatures and a hopper configured to hold a plurality of signatures are operatively coupled to the frame. A signature feeding device is disposed between the hopper and the conveyor and configured to feed the signatures from the hopper to the conveyor.