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![Cover for Georg Helm · The Historical Development of Energetics - Boston Studies in the Philosophy and History of Science (Pocketbok) [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-pocketbok&class=scaled&v=1604002364)
![Cover for Georg Helm · Die Energetik in ihrer geschichtlichen Entwicklung (Pocketbok) [German edition] (2012)](https://imusic.b-cdn.net/images/item/original/422/9783864445422.jpg?georg-helm-2012-die-energetik-in-ihrer-geschichtlichen-entwicklung-pocketbok&class=scaled&v=1410165178)
![Cover for Georg Helm · The Historical Development of Energetics - Boston Studies in the Philosophy and History of Science (Innbunden bok) [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-innbunden-bok&class=scaled&v=1410158949)
![Cover for Georg Helm · Die Theorien Elektrodynamik Nach Ihrer Geschichtlichen Entwickelung (Innbunden bok) [Reprint 2020 edition] (1904)](https://imusic.b-cdn.net/images/item/original/617/9783112375617.jpg?georg-helm-1904-die-theorien-elektrodynamik-nach-ihrer-geschichtlichen-entwickelung-innbunden-bok&class=scaled&v=1694642003)
![Cover for Georg Helm · Die Energetik Nach Ihrer Geschichtlichen Entwickelung (Innbunden bok) [Reprint 2022 edition] (1901)](https://imusic.b-cdn.net/images/item/original/779/9783112688779.jpg?georg-helm-1901-die-energetik-nach-ihrer-geschichtlichen-entwickelung-innbunden-bok&class=scaled&v=1749317942)
![Cover for Georg Helm · Die Energetik: Nach Ihrer Geschichtlichen Entwickelung (Innbunden bok) [Reprint 2022 edition] (1901)](https://imusic.b-cdn.net/images/item/original/114/9783112681114.jpg?georg-helm-1901-die-energetik-nach-ihrer-geschichtlichen-entwickelung-innbunden-bok&class=scaled&v=1762546503)