Dr R.F.

Crystal & Gem (DK Eyewitness)

By Harding, R, Harding, R R, Smyes, R, Symes, Dr R.F., Roger R. Harding, R.F. Symes

Rock and Mineral (Eyewitness Guides: 2)

By Pellant, Chris, Symes, Dr R.F., Chris Pellant, R.F. Symes

Crystal and Gem (Eyewitness Guides: 25)

By Symes, R. F., Harding, R.R., R, Dr R.F., R. Harding, R.F. Symes