Ühendriikide Geoloogiateenistus. 18. juuni 2001. Vaadatud 16.03.2009. "Obsidian, a scarce commodity in Hawai`i" (inglise). Ameerika Ühendriikide Geoloogiateenistus...
Sutrop, M; Simm, K (2020). Developing guidelines for the distribution of scarce medical resources during the COVID-19 pandemic. The Estonian case. Trames...
Metals: Will We Have Enough?". David L. Chandler. "Clean energy could lead to scarce materials. Rising demand for wind turbines and electric vehicles could strain...
47 KB (3732 sõna) - 15. detsember 2022, kell 18:50