PUBLICATIONS    ON    PHOSPHATES,    ETC.  595 
Moses,  O.  A.  The  phosphate  deposits  of  South  Carolina.  In  Mineral  Re- 
sources U.  S.  for  1882,  pp.  504-521.     1883. 
Orton,  E.  Gypsum  or  land  plaster  in  Ohio.  In  Mineral  Resources  U.  S. 
for  1887,  pp.  596-601.     1888. 
Penrose,  R.  A.  F.  Nature  and  origin  of  deposits  of  phosphate  of  lime.  Bul- 
letin U.  S.  Geol.  Survey  No.  46.     143  pp.     1888. 
Stubbs,  VY.  C.  Phosphates  of  Alabama.  In  Mineral  Resources  II.  S.  for 
1883-84,  pp.  794-803.     1885. 
Wilber.  F.  A.  Greensand  marls  in  the  United  States.  In  Mineral  Re- 
sou  rces  U.  S.  for  1882,  pp.  522-526.     1883. 
