Zeisel: "Switching" and "User" Box 61, Folder 4.21 Rare Book & Manuscript Library Paul Felix Lazarsfeld papers, 1930-1976Series ISubseries I.6: Methods Files Part I
Zelditch-Zimmermann Box 163 Rare Book & Manuscript Library Paul Felix Lazarsfeld papers, 1930-1976Series ISubseries I.11: Manuscripts by Others
Zubin Festschrift Paper Box 11 Rare Book & Manuscript Library Paul Felix Lazarsfeld papers, 1930-1976Series III: Additional Files, 1960-1974
"Zwei Jahre Später" (Marienthal Study) Box 39 Rare Book & Manuscript Library Paul Felix Lazarsfeld papers, 1930-1976Series ISubseries I.3: Manuscripts (Research Papers by PFL)