IEA (2020), IEA total public energy RD&D budget by technology, 1974-2019, IEA, Paris https://www.iea.org/data-and-statistics/charts/iea-total-public-energy-rd-and-d-budget-by-technology-1974-2019, Licence: CC BY 4.0
IEA (2020), IEA total public energy RD&D budget by technology, 1974-2019, IEA, Paris https://www.iea.org/data-and-statistics/charts/iea-total-public-energy-rd-and-d-budget-by-technology-1974-2019, Licence: CC BY 4.0
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