For administrative queries, please contact I.W.C. Hogervorst:

Visiting address:
Sterrenwachtlaan 11
2311 GW Leiden

Postal address:
Postbus 778
2300 AT Leiden

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

E: gro.r1784836632ivnk@1784836632tcatn1784836632oc1784836632

To contact the Secretary of the Board of the Society, please send an email to gro.r1784836632ivnk@1784836632draob1784836632.