Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 831
century, or nearly so, and they are called lanthanum, zirconium,thorium, cerium, didymium, yttrium, erbium, &c. They occur as sili-cates or phosphates very sparingly, and in a few localities in Norway; butsome of them have now been found more abundantly in America. Tiicminerals, from which for…
Inventions
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