What do 'recto' and 'verso' mean?

Printing Terminology: Recto and Verso

Night and Day (verso)

Crucifixion (The Annunciation)

The Market Hall

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Night and Day (verso)

Two Leaved Screen, Leda and the Swan

A Scene from 'The Wife of Bath's Tale

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Ship Tavern Sign

Group of Five Women Mocking an Effaced Figure (Falstaff in the

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Verso / recto

Night and Day (verso)