An in-line book making system produces sets of signatures ready for "come and go" binding. Webs printing in respective presses are slit collated and folded into signatures which are fed in succession to two collecting pockets, one pocket receiving a batch of signatures totalling all the pages of the book and then the other pocket receiving a similar batch. The batches are fed in identical orientations from the respective pockets to respective conveyors, which cause a relative rotation of the batches through 180.degree.. The two batches are then brought together, when they together contain all the pages for two books in a disposition which can be bound in come and go binding and then cut apart.The signatures may be made by a former-folding process.The conveyor system may additionally be operable to eliminate the 180.degree. relative rotation, in case simple binding is desired.