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.r1776275124ivnk@1776275124tcatn1776275124oc1776275124

To contact the Secretary of the Board of the Society, please send an email to gro.r1776275124ivnk@1776275124draob1776275124.