Book excerpt: Stoic Six Pack 9 - The PreSocratics brings together a selection of key primary and secondary texts to help shed light on this important early philosophy school. Anaximander's Book, the Earliest Known Geographical Treatise by William Arthur Heidel. The School of Miletus: Thales, Anaximander, Anaximenes and Heraclitus by John Marshall. The Pre-Socratics by George Grote. The Logic of the Pre-Socratic Philosophy by William Arthur Heidel. The Eleatics: Xenophanes, Parmenides, Zeno and Melissus by John Marshall. The Pre-Socratics by Benjamin Cocker.