SUBJECT
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Plants
2
Plants, Ornamental
1
Research
1
Science
2
Science and state
1
Scientific expeditions
1
Scientific societies
1
Solar system
1
Spanish
1
Spanish language
1
Study and teaching (Primary)
1
Sun-dials
1
Technology and state
1
Typhoons
2
Vegetation classification
1
Vegetation mapping
1
Water pollution
1
Weights and measures
1
Zoology
2
de Cuellar, Juan
1