ILLUSTRATIONS. 
Page 
Plate I. Map of the United States, showing location of cement plants 15 
II. Geological map of Alabama. Mississippi, and part of Georgia 62 
III. Map of the chalk region of southwestern Arkansas 100 
IV. Map of California, showing areas of limestone 116 
V. Geological map of Iowa 148 
VI. Geological map of Kentucky and Tennessee 172 
VII. Geological map of the lower peninsula of Michigan 190 
VIII. Map of Michigan, showing location of cement plants and marl de- 
posits 194 
IX. Geological map of northeastern Missouri and southwestern Illinois. 220 
X. Map of New York, showing distribution of limestones 246 
XI. Map of the Hudson Eiver cement district, New York 254 
XII. Geological map of Ohio and Indiana 270 
XIII. Map of the Lehigh district, Pennsylvania-New Jersey, showing dis- 
tribution of cement rock 284 
XIV. Map of parts of Texas, Oklahoma, and Indian Territory 308 
XV. Map of Virginia, West Virginia, Maryland, and part of Pennsyl- 
vania 314 
Fig. 1. Portland-cement production of the United States, 1888-1903 16 
11 
