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Piero della Francesca, Portraits of the Duke and Duchess of Urbino, Federico da Montefeltro and Battista Sforza, 1467-72, tempera on panel, 47 x 33 cm (Galleria degli Uffizi, Florence).
It is an educat ...
Orsanmichele, Florence, 1349 loggia (1380-1404 upper stories). Speakers Dr. Steven Zucker and Dr. Beth Harris.
It is an educational content by Khan Academy, site that contains a wide variety of educati ...