File:Modern 2.jpg: Revision history

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29 November 2018

  • curprev 20:2220:22, 29 November 2018‎ Lmileto talk contribs‎ 218 bytes +218‎ Radiation Dosage Calculator, published by Connecticut State Office of Civil Defense, 1950-51. Collection of Oak Ridge Associated Universities. Image source: https://www.orau.org/PTP/collection/sliderules/raddoscalc.htm
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