sing 
ernat. 
ich. 
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ng 
he 
nts 
from 
ti- 
light 
obser- 
acity 
the 
rvey 
ng of 
Tl 
ources, 
remote 
Sym- 
ta, 
Waggaman, W.H., 1952, Phosphoric acid, phosphates, and phosphatic 
fertilizers: New York, Reinhold Pub. Corp., Am. Chem. Soc. 
Monograph 34. 
Waggaman, W.H., and Ruhlman, E.R., 1960, Phosphate rock, pt. III: 
Processing and utilization: Wash. D.C., U.S. Bureau of Mines, 
info. Cire. 7951. 
ward, P.lL., Endo, E.T., Harlow, D.H., Allen, R., Marquez, D., and Eaton, 
J.P., 1974, Development and evaluation of a prototype global 
volcano surveillance system utilizing the ERTS-1 satellite data 
collection system: U.S. Geol. Survey Open-File Rept., 154 p; also 
available as NASA-CR-139222, 168 p. 
Watkins, A.H., 1975, The role of the EROS Data Center within the earth 
resources program (abs.): NASA L.B. Johnson Space Center Earth 
Resources Survey Symposium, Houston, Tex. 1975, Abs., Paper U-2, 
p. 41-42. 
Watson, Kenneth, 1974, Geothermal reconnaissance from quantitative analy- 
sis of thermal infrared images, in Internat. Symposium on Remote 
Sensing of Environment, 9th, Ann Arbor, Mich. 1974, Proc., p. 1919- 
1932. 
, 1975, Geologic applications of thermal infrared images: 
IEEE Proc., January 1975, p. 128-137. 
Watson, R.D., and Hemphill, W.R., 1976, Use of an airborne Fraunhofer 
line discriminator for the detection of solar stimulated 
luminescence: U.S. Geol. Survey Open-File Rept. 76202. 
Watson, R.D., Hemphill, W.R., and Hessin, T.D., 1973, Quantification of 
the luminescence intensity of natural materials, in Am. Soc. 
Photogramm. Symposium for the Management and Utilization of Remote 
Sensing Data, Sioux Falls, S. Dak. 1973, Proc., p. 364-376. 
Watson, R.D., Hemphill, W.R., Hessin, T.D., and Bigelow, R.S., 1974, 
Prediction of the Fraunhofer line detectivity of luminescent 
materials, in Internat. Symposium on Remote Sensing of Environment 
9th, Ann Arbor, Mich. 1974, Proc., p. 1959-1980. 
Weisnet, D.R., McGinnis, D.F., and Pritschard, J.A., 1974, Mississippi 
River floods by the NOAA-2 satellite: Water Resources Bull., v. 10, 
no. 5, p. 1040-1049. 
Wilheit, T., Nordberg, W., Blinn, J., Campbell, W., and Edgerton, A., 
1973, Aircraft measurement of microwave emission from Arctic sea ice: 
Remote Sensing of Environment, v. 2, no. 3, p. 129-139. 
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