56 



772. AMBER. 



773. 

 774. 



775. PETROLEUM. 



776. 



777. ASPHALTUM. 



it vis PI 



778. 

 779. 



780. ELATERITE. 



781. ANTHRACITE. 



3n $? ) 



t> s*** C/v. 



782. 

 783. 

 * 784. 

 785. BLACK COAL. 



Baltic Coast, Prussia. 



& m 



Baltic Coast, Prussia. 



W *& B 



0*7 <7ree/, Pa. 



Hannover, Germany. 



Q 3=p ^^ 



Trinidad. 



JP -* 



1U /|V 



Trinidad. 



JU jl^: 



HL 7N 



Hannover. 



H 5 S 



Castleton, Derbyshire, 



Saxony. 

 Loire, France. 

 Portugal. 

 Pennsylvania. 

 Zwickau, Saxony. 



