Volumes 18, 19, and 20 of Alle de Brieven / Collected Letters became available at the end of 2024, completing the series begun in 1939. Download for free.
Which number?
Master list (pdf) of all 602 L-numbers, their Leeuwenhoek number, and their Collected Letters number
Manuscripts
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Letter 18 (AB 26) of 1676-10-09 to Henry Oldenburg
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Letter 19 (AB 31) of 1677-03-23 to Henry Oldenburg
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Letter 20 (AB 32) of 1677-05-14 to Henry Oldenburg
Letter (AB 46) of 1679-05-15 to Christiaan Huygens