Todos los 8 Georg Helm lanzamientos en Book, Paperba... Book
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![Cover for Georg Helm · The Historical Development of Energetics - Boston Studies in the Philosophy and History of Science (Paperback Book) [Softcover reprint of the original 1st ed. 2000 edition] (2012)](https://imusic.b-cdn.net/images/item/original/152/9789401059152.jpg?georg-helm-2012-the-historical-development-of-energetics-boston-studies-in-the-philosophy-and-history-of-science-paperback-book&class=scaled&v=1604002364)
![Cover for Georg Helm · Die Energetik in ihrer geschichtlichen Entwicklung (Paperback Book) [German edition] (2012)](https://imusic.b-cdn.net/images/item/original/422/9783864445422.jpg?georg-helm-2012-die-energetik-in-ihrer-geschichtlichen-entwicklung-paperback-book&class=scaled&v=1410165178)
![Cover for Georg Helm · The Historical Development of Energetics - Boston Studies in the Philosophy and History of Science (Hardcover Book) [1999 edition] (2000)](https://imusic.b-cdn.net/images/item/original/749/9780792358749.jpg?georg-helm-2000-the-historical-development-of-energetics-boston-studies-in-the-philosophy-and-history-of-science-hardcover-book&class=scaled&v=1410158949)
