-
481.
Roofs
Subjects
Structural framesGirdersBuildingBuilding, Iron and steelTrussesCarpentry
-
482.
Rope
Subjects
Textile fibers
-
483.
Ropework
Subjects
Handicraft
-
484.
Rubber industry and trade
Subjects
-
485.
Sailors
Subjects
Naval art and science
-
486.
Sales management
Subjects
Industrial managementSelling
-
487.
Sales personnel
Subjects
Commercial agentsRetail tradeAdvertising
-
488.
Sawmills
Subjects
Mills
-
489.
Scaffolding
Subjects
Temporary buildings
-
490.
Scalextric toys
Subjects
Automobiles
-
491.
School buildings
Subjects
School facilities
-
492.
Screens
Subjects
Interior decoration
-
493.
Sectors econòmics
Subjects
Economics
-
494.
Self-help housing
Subjects
Dwellings
-
495.
Service industries
Subjects
Sectors econòmics
-
496.
Sewing
Subjects
Home economics
-
497.
Sex role in mass media
Subjects
Mass media
-
498.
Shipping conferences
Subjects
Steamboat linesMonopoliesOcean travelMaritime transportIndustrial trusts
-
499.
Shipwrecks
Subjects
Marine accidentsAdventure and adventurersDisasters
-
500.
Shoes
Subjects
Footwear
-
501.
Shopping centers
Subjects
Retail tradeInfrastructure (Economics)
-
502.
Shorthand
Subjects
Business educationWritingOffice practice
-
503.
Signs and signboards
Subjects
Outdoor advertising
-
504.
Silk
Subjects
Textile fabrics
Last updated dated: 11/10/2025