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المصادر https://www.statista.com/statistics/727582/price-of-rubber-per-pound/ https://www.bloomberg.com/news/articles/2021-04-13/rubber-scarcity-creates-new-headache-for-beleaguered-automakers

• https://www.automotivelogistics.media/insight/material-shortages-are-forcing-a-supply-chain-rethink-in-automotive/42201.article
• https://economictimes.indiatimes.com/small-biz/sme-sector/rubber-scarcity-creates-new-headache-for-beleaguered-automakers/articleshow/82059970.cms?from=mdr
• https://www.cnbc.com/2021/07/09/what-the-impending-rubber-apocalypse-means-for-the-us-economy.html
• https://www.bbc.com/future/article/20210308-rubber-the-wonder-material-we-are-running-out-of#:~:text=These%20factors%20combined%20means%20that,%2C%20around%207%25%20of%20production.
• https://www.nytimes.com/2020/06/09/world/europe/king-leopold-statue-antwerp.html#:~:text=the%20main%20story-,Statue%20of%20Leopold%20II%2C%20Belgian%20King%20Who%20Brutalized%20Congo%2C%20Is,would%20remain%20in%20a%20museum.
• https://www.britannica.com/biography/Leopold-II-king-of-Belgium
• https://www.customrubbercorp.com/blog/November-2021/Will-There-Be-a-Rubber-Shortage
• https://www.bloomberg.com/news/newsletters/2021-04-14/supply-chains-latest-rubber-shortage-worries-the-auto-industry
• https://www.autonews.com/suppliers/rubber-scarcity-creates-new-headache-beleaguered-automakers
• https://tejimandi.com/research/28/512584?rubber-prices-are-on-fire-what-is-its-impact-on-the-tyre-industry
• https://neobexmedical.com/the-natural-rubber-crisis-and-its-impacts/
• https://www.acs.org/content/acs/en/education/whatischemistry/landmarks/syntheticrubber.html
• https://www.coruba.co.uk/blog/wwi-the-development-of-synthetic-rubber/
• https://legionmagazine.com/en/2012/01/the-rush-for-rubber/