The Presocratic Writings
Volume 1: Transcription of the famous collection of Presocratic thinkers in ninety chapters, originally edited by H. Diels and W. Kranz (Die Fragmente der Vorsokratiker, ed. by H. Diels-W. Kranz, 3 vols., Weidmann, Berlin, 1952).
Volume 2: Ancilla to the Pre-Socratic Philosophers. A complete translation of the fragments of the pre-Socratic philosophers given in the fifth edition of Diels, Fragmente der Vorsokratiker, by Kathleen Freeman. Harvard University Press, Cambridge, 1948.
Please note that all B fragments from the Diels and Kranz edition are linked to the Freeman translation, and vice-versa.