In this lecture, Professor Warner recounts the process by which entries in Plantin’s and Moretus’s journals and ledgers have proved the critical first clues, leading on to other clues, to the complicated histories of certain sixteenth century Low Countries’ imprints (one originally from Gent, the other Antwerp): that is, their itinerary from city to city, from printing house to seller, from seller to printing house again to seller, the revelation of which makes it possible not only to account for their present material condition, but in one case, to infer with some confidence through what intermediate condition it at one time passed.