Volumes 1 through 20 of Alle de Brieven / Collected Letters, the complete series. Download for free.
Master list (pdf) of all 602 L-numbers, their Leeuwenhoek number, and their Collected Letters number
great-grandmother Neeltje's nephew Abraham's grandson Maarten Pieters Hogenhouck (1650-1720) buried in Oude Kerk
DTB Delft inv. 47, fol. 154