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JSTOR: Leonard James Spencer. 1870-1959
Spencer wrote two books on minerals and gemstones, which have had a wide circulation: The world's minerals (1911) and A key to precious stones (1936). ...
Internet Archive Search: subject:"Mineralogy"
The world's minerals - Spencer, Leonard James, b. 1870 Keywords: Mineralogy Downloads: 46. The world's minerals - Spencer, Leonard James, 1870- ...
James Leonard libri - I Libri dell'autore: James Leonard - webster.it
The World's Minerals (1916) · The World's Minerals (1916) di Leonard James Spencer - Kessinger Publishing - January 2008. Prezzo: € 36.33 ...