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How did Callimachus organize information about authors in the Pinakes?

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Abu El-Abbas mosque in Alexandria, Egypt, featuring ornate domes, arched entrances, intricate stonework, and a large patterned courtyard in the foreground. — Alexandria The mosque of Abū al-ʿAbbās al-Mursī, Alexandria, Egypt.

Callimachus organized the Pinakes—a massive, 120-book catalog of the works held in the Library of Alexandria—as an elaborate critical and biographical record of authors and their writings.12

To manage the vast collection, he categorized literature into specific fields of learning. Surviving fragments indicate that these divisions included:
* Rhetoric
* Law
* Epic, tragedy, and comedy
* Lyric poetry
* History
* Medicine
* Mathematics
* Natural science
* Miscellaneous works3

For each entry, Callimachus provided essential bibliographical and biographical details. According to information preserved by Galen, these records typically included the author's name, the title of the work, the name of the editor, the place of origin, the length of the text (measured in lines), and a notation on whether the manuscript was mixed or unmixed. This systematic approach established a foundational model for future bibliographical catalogs.3