SUBJECT INDEX 



(Bold-face numbers indicate places where topics are discussed in some detail.) 



Abandoned stream channels as source of 

 aggregate, 646 



Abrasion, 6, 7, 440, 458 



Abrasives, 35, 490 



Absecon Inlet, N. J., 313 



Absorption in concrete, 458 



Abutments, 182 



Accelerated erosion, 388, 418 



Accretion bars, 214 



Acetylene tetrabromide, 572 



Acid rocks, 33 



Acidizing limestone, 621 



Acoustic impedance, 85 



Acoustic properties of sea bottom, 658 



Actinium, 565 



Adhesion, 148 



Adirondack magnetites, 528 



Adsorption, 97, 98, 109, 153, 234, 468 



Aerial photographs, 262, 367, 643, 646, 

 647 



Aero Service Corporation, 278 



Aerodynamic forces causing soil move- 

 ment, 402 



Africa, 513 



AFS clay, 476 



Agate, 131, 489 



Aggradation, 36, 393, 410 



Aggregates for concrete, 35, 437-463, 

 639, 646, 650 



Agriculture, Department of, 61; see also 

 United States Government 



Agriculture, relation of, to permafrost, 266 



Aguijan Island, 642 



Aguilar, Argentina, 529 



Air, effect of, on tunneling, 196-206 



Airborne magnetometer, 82, 84 



Airfield flight strips, 142, 264, 268 



Airfield siting, 648, 649 



Air-set strength, 479 



Alabama, 481 



Alaska, 247 



Alfalfa, 399 



Algae, 15, 24, 456 



Algiers, Algeria, 233, 297 



Alignment of rivers, 223 



All- American Canal, Calif., 371 



Alluvial fans, 8, 26, 129, 131, 336, 449, 643 



Alluvial Valley, Lower Mississippi River, 

 210-226 



Alluvium, 84, 210, 218, 538, 545 



Alluvium-filled valleys, 383 



Alluvium fills, 407, 642 



Allegheny River, 330 



Allowable loads, 178 



Alkali-aggregate reaction, 442 



Alkali-aggregate soils, 48, 49 



Alkalinity, 55, 470 



Alpine mud flow, 230 



Alps, 42 



Alsace-Lorraine, 516 



Altiplanation terraces, 256 



Alumina, 55, 58, 507, 513, 524, 542 



Aluminum ores, 525 



Aluminum silicates, 233, 464 



Alundum reservoir, 599 



Alzada district, Mont., 427 



Amber, 489 



American Association of Petroleum Geol- 

 ogists, 91 



American Association of State Highway 

 Officials, 178 



American Foundrymen's Association, 478 



American Foundrymen's Society, 478 



American Geographical Society, 91 



American Geophysical Union, 62, 91 



American Institute of Mining and Metal- 

 lurgical Engineers, 91 



American Meteorological Society, 91 



American Petroleum Institute, 91, 586, 

 588 



678 



