"New York (N.Y.) History 1898-1951" . . "Social problems New York (State) New York History." . . "Lebensreform." . . "Undercover operations History New York." . . "Soziale Probleme." . . "1898 - 1951" . . "Undercover operations New York (State) New York History." . . "Social action New York (State) New York History." . . "Electronic books." . . "New York (N.Y.)" . . "SOCIAL SCIENCE General." . . "New York undercover private surveillance in the Progressive Era" . "New York undercover private surveillance in the Progressive Era"@en . . . . . . . . . . . . "New York undercover : private surveillance in the Progressive Era"@en . . "New York undercover : private surveillance in the Progressive Era" . . . . . . . . . . . . . . . . . "Electronic books"@en . . . . . . . . . "Livres électroniques" . . . . "History" . "History"@en . . . . . . "Social problems History New York." . . "Geschichte 1880-1930." . . "Social action History New York." . . . . "BUSINESS & ECONOMICS Infrastructure." . . "New York, NY." . . "New York (N.Y.) Social conditions" . . "Verdeckte Ermittlung." . . "New York <NY>" . . "Soziale Situation." . .