-
937.
Silver mines
Subjects
Mines and mineral resources
-
938.
Sintering
Subjects
Powder metallurgy
-
939.
Smart cards
Subjects
Security systemsMicroprocessors
-
940.
Smart materials
Subjects
Materials
-
941.
Smartphones
Subjects
Cell phones
-
942.
Smithery
Subjects
-
943.
Social media
Subjects
Social interactionDigital mediaWeb 2.0
-
944.
Soil mechanics
Subjects
Earthwork
-
945.
Solar buildings
Subjects
Solar heatingBuildings
-
946.
Solar cells
Subjects
Electric batteriesPhotovoltaic cellsSolar energy
-
947.
Solar collectors
Subjects
Solar heatingSolar energy
-
948.
Solar energy
Subjects
Renewable energy sourcesSolar radiation
-
949.
Solar heating
Subjects
Solar thermal energy
-
950.
Solar power plants
Subjects
Electric power-plantsSolar energy
-
951.
Solar thermal energy
Subjects
Solar energyHeat engineering
-
952.
Sonar
Subjects
Underwater acousticsDetectorsEcholocation (Physiology)
-
953.
Sound
Subjects
Radiation
-
954.
Sound in motion pictures
Subjects
-
955.
Sound recording and reproducing
Subjects
Radio
-
956.
Sound recordings
Subjects
Audio-visual materials
-
957.
Space flight
Subjects
Astronautics
-
958.
Space policy
Subjects
Science and stateTechnology policy
-
959.
Space rate
Subjects
Astronautics
-
960.
Space security
Subjects
International security
Last updated dated: 13/09/2025