Correspondence with:
Acadian Hospital University of Amsterdam
Architecture Museum, Foundation
Bres Planète
Cate, H.W., ten
Dudok, W.M.
Finsterlin, Hermann
Fritschi-Moerman, H.M.
Gottmer, J.H.
Hartjesveld, C.J.
Hommes, H.
Ingen Housz, Pol
Klautz, J.P.
Komter, Auke
MacMillan Company
Mendelsohn, Louise
Meylan, Eugène
Mons, J.J.
Nicolas, Joep
Niegeman, Johan
Niegeman, Johan and Bé
Pehnt
Psychopolis The Free Academy
Foundation 1940-1945
Tummers, Nic
Veens Publishing Company
[Wijdeveld], Jeanette and Maarten (grandchild)
Wijdeveld, Roland
Wijdeveld, Wolfgang
Wils, family