INDEX 
industrial and pharmaceutical, 
22, 399, 414-18, 432 
introduction, 60 
salt-tolerant, 223, 289, 409 
selection, 38, 60, 351-57, 397- 
402, 415, 424-25 
spread of alien, 351-52 
Plant ecology, needed research, 431 
Plant physiology, needed research, 
431 
Poa scabrella, 345 
Poa species, 346, 349 
Pollen analysis, 166-67 
Polygonum species, 338 
Population-supporting capacity, 
27, 48-49, 214-18, 252, 362- 
63, 380-82, 386-87, 391, 419- 
23, 426 
Poterium varicosum, 338 
Powell, J. W., 18 
eowellenS. ll 5) 535.280 
Prairie oe 22 
Preciozi, P. C., 95 
Precipitation, estimation, Ci, UGG 
orographic, 304 
prediction, 135 
variability, 77-79, 86-94, 143- 
54, 162-70, 295-97 
Precipitation, induced, 30, 50-s1, 
Day AQUGDs, JOOS 
GORE, Qi, Be 
{CemUuICleIQOO_4, {us — 10) 
prospects for, 299, 311, 318 
silver iodide seeding, 291-95, 
385-9 
Preservation of habitat, 432 
Primitive man, 15-17 
Project Cirrus, 302-4, 306-8 
Prosopis juliflora, 238, 338 
Prosopis species, 164 © 
Psoralea lanceolata, 5 
Public information, 434 
45] 
Quality of water (see Water) 
Oureshrm INA AL 292 
Range improvement, 22, 38, 41-42, 
160, 179-88, 182-88, 360-63, 
BO), AGUS =I) 
centers, 184 
costs, 361 
fertilization, 357, 359 
needed research, 357-60, 431 
regeneration, §9, 185-87, 425 
relation to irrigation, 43, 361 
social factors, 42, 181, 188, 338, 
340, 380-82 
water supply, 184 
Redfieldia flexuosa, 5 
Retama species, 400 
Research (see also Cooperative 
research; _— Interdisciplinary 
programs) 
public support for, 434 
Reservoir evaporation, 131-32, 
196-97 
Reservoir silting, 32, 173, 175, 197 
IRhoadiAN@ x 334 
Richards, es A. 5 PI DIS, No} 
Rio Grande, 174, 235 
salinity, 284-86'" 
Robbins, W. W.,; 351, 352 
Rockefeller Foundation, 273, 368 
Rodents, 15, 23, 371 
Roman settlement, 52 
Rumex hymenosepalus, 414-418 
SHIMarA, LL, 16 
animal range, 378 
climatic stability, 125 
Saline Water Conservation Pro- 
BEM, 57, WIA6O, WX, AOA, 
266, 269, 272, 277, 435 
Salerolerant plants, 223, 289, 409 
Sand dune fixation, 401 
Sansome, F. W., 348 
Samusie, (C. Oe, 1s 
