Augustijn van Hasselt, whose name first appears in 1534 during the troubles in Münster, is mentioned in the Chronika of the Family of Love as Hendrik Niclaes's secretary and printer. Although not a single book seems to have been published with his imprint I have recently discussed what his part in Antwerp and Kampen was in the publication of a series of writings by the sectarian leader. We also know from the same source that Augustijn went to Vianen to run a printing shop for Plantin at the end of 1566, but that this press has soon to be moved to Wesel. What he published in that town, however, has hitherto been unknown. Assuming that he worked with type which came from Plantin it now seems possible to reconstruct his list of publications, despite the fact that no typographical difference exists between the products of two printers working with the same type, cast from the same matrices. Secondary factors must thus be advanced to show to whom a particular edition can be ascribed. An analysis along these lines discloses the fact that Augustijn was one of the most active publishers of Dutch Protestant books, sixteen or seventeen of which could be indicated. The fact that a book started in Vianen had to be completed in Wesel allows us to distinguish between what was printed in the two towns. After Augustijn had again worked for Hendrik Niclaes for a few years a final rift took place in 1573. He then disappears from view until 1592, when he still appears to be active as the owner of a small press.