1. Costs and compensations Author(s): Conn, G. P., author Publication: [New York?] : [publisher not identified], [1891?] Subject(s): RailroadsSanitationVentilationPersonnel Management
2. Hygienic training of men in charge of railway trains Author(s): Conn, G. P., author Publication: [New York?] : [publisher not identified], [1894?] Subject(s): Inservice TrainingRailroadsHygiene
