a colleague who is one of the organizers of the Madrid ICM 2006 has asked me whether it is possible to find memorabilia of the Paris congress in 1900 (posters announcing the congress, photographs, invitations to the congress dinner... any kind of memorabilia).
I have asked some French colleagues and it seems difficult to locate such things in Paris. Perhaps only in the (private) collections of mathematicians who attended the congress and who may have kept them.
Does any one of you have suggestions about this? Thanks and best wishes,