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This website gives a good answer to the question   "Why did the Ptolemaic mint place the image of two eagles on so many of its bronze coins?"

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Based on countermarks, coin types and coin hoards, this website corrects a recently published faulty attribution of coins of Ptolemy VI.

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This website gives access to a manuscript showing two types of coins, previously attributed to Ptolemy XII, that should be attributed to Cleopatra VII with her son Caesarion.