246  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,   L906,  PART    T. 
Kimball,  L.  I..  Cement.  Al  series  of  annual  articles  on  the  cemenl  industry  ana 
the  production  of  cemenl  in  the  United  Slates.  In  Mineral  Resources  I  .  S.  for  L90l| 
L902,  L903,  L904,  and  L905. 
Landes,  H.  Cement  resources  of  Washington.  In  Bulletin  No.  285,  pp.  377  383. 
1906. 
Newberry,  S.  B.  Portland  cement.  A  scries  of  annual  articles  on  Portland  ce- 
ments, appearing  in  the  various  volumes  of  the  Mineral  Resources  V.  S.  previous  to 
that  tor  L901. 
Russia. i..  I.C.  The  Portland-cement  industry  in  Michigan.  In  Twenty-second 
Ann.  Kepi.,  pt.  3,  pp.  620  686.      L902. 
Smith,  E.  A.  The  Portland-cemenl  materials  of  central  and  southern  Alabama.  In 
Senate  Doc.  No.  L9,  58th  Cong.  1st  sess.,  pp.  L2  23.     L903. 
Cemenl  resources  of  Alabama.     In  Bulletin  No.  225,  pp.  124-447.     L904. 
Taff,  J.  A.  Chalk  of  southwestern  Arkansas,  with  notes  on  its  adaptability  to  the 
manufacl  ure  of  hydraulic  cements.  In  Twenl  y-second  Ann.  Rep1 ..  pt .  :').  pp.  OS7-742. 
L902. 
