Columbia subject headings:
Architecture.
Leonardo, da Vinci, 1452-1519--Knowledge and learning.
Nature.
Harvard subject headings:
Architecture
Leonardo, da Vinci, 1452-1519--Knowledge--Architecture.
Leonardo, da Vinci, 1452-1519--Knowledge--Nature.
Nature
Princeton subject headings:
Architecture.
Leonardo, da Vinci, 1452-1519--Knowledge--Architecture.
Leonardo, da Vinci, 1452-1519--Knowledge--Nature.
Nature.