FOR    THE    YEARS    1901-1905,   INCLUSIVE.  Ill 
Eckel  (Edwin  C. ) — Continued. 
31.  The  materials  and  manufacture  of  Portland  cement. 
Ala.  Geol.  Surv.,  Bull.  no.  8,  pp.  1-59,  1904. 
Includes  a  discussion  of  the  origin  and  general  characters  of  limestone  and  other  raw  mate- 
rials used  in  cement  manufacture. 
32.  Cements,  limes,  and  plasters:  their  materials,  manufacture,  and  properties. 
New  York,  John  Wiley  &  Sons,  1905.     712  pp.,  165  figs. 
Includes  notes  on  the  geologic  distribution  of  cement  materials. 
33.  The  Clinton  hematite. 
Eng.  and  Mg.  Jour.,  vol,  79,  pp.  897-898,  2  figs.,  1905. 
Describes  the  character,  occurrence,  and  utilization  of  Clinton  iron  ores,  particularly  in  the 
town  of  Clinton,  New  York. 
34.  Cement  materials  and  industry  of  the  United  States. 
U.  S.  Geol.  Surv.,  Bull.  no.  243,  395  pp.,  15  pis.,  1  fig.,  1905. 
Describes  the  character  and  general  occurrence  of  cement  materials  and  their  preparation,  and 
in  detail  the  occurrence,  geologic  relations,  and  character  of  limestones,  shales,  and  marls 
in  the  various  States. 
35.  Iron  and  manganese  ores  of  the  United  States. 
U.  S.  Geol.  Surv.,  Bull.  no.  260,  pp.  317-320,  1905. 
Describes  the  production,  character,  and  occurrence  of  iron  and  manganese  ore  deposits  of 
the  United  States. 
36.  Limonite  deposits  of  eastern  New  York  and  western  New  England. 
IT.  S.  Geol.  Surv.,  Bull.  no.  260,  pp.  335-342,  1905. 
Describes  the  geology  of  the  region,  the  mining  developments,  and  discusses  the  character 
and  origin  of  the  ores. 
37.  The  iron  ores  of  northeastern  Texas. 
U.S.  Geol.  Surv.,  Bull.  no.  260,  pp.  348-354,  1905. 
Describes  the  general  geology,  and  the  occurrence,  composition,  and  origin  of  the  ores. 
38.  The  American  cement  industry. 
U.  S.  Geol.  Surv.,  Bull.  no.  260,  pp.  496-505,  1905. 
Describes  the  classification  and  production  of  cement,  and  the  geologic  relations,  occurrence, 
and  character  of  the  raw  materials  in  the  United  States. 
39.  Portland-cement  resources  of  New  York. 
U.  S.  Geol.  Surv.,  Bull.  no.  260,  pp.  522-530,  1905. 
Describes  the  occurrence,  composition,  and  geologic  relations  of  cement-making  rocks  of 
New  York. 
40.  Pyrite  deposits  of  the  western  Adirondacks,  New  York 
U.S.  Geol.  Surv.,  Bull.  no.  260,  pp.  587-588,  1905. 
Describes  the  occurrence  and  character  of  pyrite  deposits,  and  the  mining  and  milling  of  the 
ore. 
Eckel  (Edwin  C.)  and  Bain  (H.  F.). 
1.  Cement  and  cement  materials  of  Iowa. 
Iowa  Geol.  Surv.,  vol.  15,  Ann.  Rept.,  1904,  pp.  33-124,  2  pis.,  1905. 
Describes  the  process  of  cement  manufacture,  and  the  geologic  occurrence  and  character  of 
cement  materials  in  Iowa. 
Eckel  (Edwin  C.)  and  Crider  (A.  F.). 
1.  Geology  and  cement  resources  of  the  Tombigbee  River  district,  Mississippi- Alabama. 
58th  Cong.,  3d  sess.,  Sen.  Doc.  no.  165,  23  pp.,  1  pi.  (map),  1905. 
Describes  the  occurrence  and  character  of  limestones  and  other  materials  in  this  region 
required  in  the  manufacture  of  Portland  cement. 
Eckel  (Edwin  C),  Hayes  (C.  W.)  and. 
1.  Iron  ores  of  the  Cartersville  district,  Georgia. 
See  Hayes  (C.  W.)  and  Eckel  (E.  C),  1. 
2.  Occurrence  and  development  of  ocher  deposits  in  the  Cartersville  district,  Georgia. 
See  Hayes  (C.  W.)  and  Eckel  (E.  C),  2. 
