- FondsNewmanM - Papers of Max Newman
- SeriesBox 2 - Documents and letters relating to mathematics and mathematicians
- File7 - Correspondence with and concerning L.E.J. Brouwer
- ItemALS in German from Laren
- Item1 - Autograph postcard signed from Laren
- Item2 - Autograph postcard signed, in German, from Laren
- Item3 - Autograph postcard signed from Basel
- Item4 - ALS from Laren
- Item5 - Autograph postcard signed from Cambridge
- Item6 - ALS from Blaricum
- Item7 - ALS from Lugano
- Item8 - TLS from Arend Heyting, Laren
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