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
Issued receipts, “rekeningen”, to two nephews for dry goods. The other was on 30 May 1658.
Weeskamer Delft, boedel (estate) inv. 4543