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

in the Publications section

Book printing technology
led to variant editions

Two variants of
Levende Dierkens

Bound version of
Arcana Naturae Detecta

Frontispiece of
Vijfde Vervolg
by Romeyn de Hooghe

Excerpts from two dozen
early letters published
in French translation
by Pierre Bayle