IL:~plans, street views, reproductions/Utrecht (city); photographs, perspective drawing, cross-sections, floor plans, photographs models/Music center Vredenburg in Utrecht, arch. Hertzberger; urban planning studies/Utrecht (city), arch. Kuiper; urban studies/Utrecht (city), arch. Oud; perspective drawing/Hoog Catharijne in Utrecht, arch. Das - Das; perspective drawing/Hoog Catharijne in Utrecht, arch. Rudolf Das; photomontage, urban design study/Hoog-Catharijne te Utrecht, arch. Hertzberger - Spruit; photo/passage; perspective drawing/Rietveld-Schröderhuis, Utrecht, arch. Rietveld; reproduction/Cirkel van Otterlo; exterior photo/archive building insurance company De Utrecht in Utrecht, arch. Kropholler - Staal; ~~SA:~Berlage, Bijvoet, Van Eyck, Holsboer, Moreelse, Kuiper, Peutz, Vink listed without initials.~Keldermans, Keldermans, Keldermans listed as: "the [...] Keldermans family of architects".~ Also listed: Jhr. G.G. Calkoen (as Jhr. G.G. Kalkoen).~Das, Das also listed as Das brothers.