Richard Maxwell Pearl

1913 – .

• Colorado gem trails and mineral guide
• Geology
• Handbook for prospectors
• Popular gemology
• Gems, minerals, crystals, and ores
• Successful mineral collecting and prospecting
• Rocks and minerals
• The wonder world of metals
• 1001 questions answered about the mineral kingdom
• American gem trails
• Seven keys to the Rocky Mountains
• 1001 answers to questions about earth science