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Polis - Wikipedia
Polis | Definition & Facts | Britannica
Polis - Ancient Greek City-States - ThoughtCo
The Greek polis (article) | Classical Greece | Khan Academy
Polis Definition & Meaning - Merriam-Webster
Polis - World History Encyclopedia
Polis - Classics - Oxford Bibliographies
City-state | Definition, History, & Facts | Britannica
Polis | SpringerLink
POLIS | English meaning - Cambridge Dictionary