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.r1652690544ivnk@1652690544tcatn1652690544oc1652690544

To contact the Secretary of the Board of the Society, please send an email to gro.r1652690544ivnk@1652690544draob1652690544.