Inscription
lower center in plate: J.D'ALEMBERT.; lower left in plate: H. Watelet. SC. 1754.; lower right in plate: cochin.filius delinea; lower right verso in graphite: #19
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lower center in plate: J.D'ALEMBERT.; lower left in plate: H. Watelet. SC. 1754.; lower right in plate: cochin.filius delinea; lower right verso in graphite: #19