DESCRIPTION OF THE ECONOMIC AND GEOLOGIC MAP 371 



References are given to the literature of the various materials 

 which have been fully described in other publications, and in 

 some cases abstracts have been made from reliable authorities. 

 "Wherever new information is at the disposal of the author a 

 brief synopsis of it is given. 



It was originally hoped that statistics of the production of the 

 various minerals could be given, but this project was abandoned 

 because it involved more labor and expense than was possible up 

 to the time of publication. 



