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
mentor Jacob Spoors (1595-1677), surveyor, attorney, and notary, living on the Oude Delft, was buried in the Oude Kerk.
DTB Delft inv. 43 , folio 7