For administrative queries, please contact Ms C.H.M. Verhaar:

Visiting address:
Sterrenwachtlaan 11
2311 GW Leiden

Postal address:
Postbus 778
2300 AT Leiden

T: +31-(0)71-527-7748

E: gro.r1632202536ivnk@1632202536tcatn1632202536oc1632202536

To contact the Secretary of the Board of the Society, please send an email to gro.r1632202536ivnk@1632202536draob1632202536.