Leonard James Spencer

• Precious Stones, a Popular Account of Their Characters, Occurrence and Applications, with an Introduction to Their Determination, for Mineralogists, ... Etc. with an Appendix on Pearls and Coral
• The world's minerals
• Key to precious stones
• Precious Stones, a Popular Account of Their Characters, Occurrence and Applications, with an Introduction to Their Determination, for Mineralogists, Lapidaries, Jewellers, etc. with an Appendix on Pearls and Coral