References (continued)
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18.

R. Spirtas

and H. J. Levin, Characteristics of Particulate Patterns 1957-1966,

National Air Pollution Control Administration, Raleigh, N. C., Publication

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19, L. J. Hagen

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Plains," Atmos. Environ. 7, 323 (1973).

,

20. Air Quality Data from the National Air Surveillance Networks and Contributing
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R. F. Pueschel, B. A. Bodhaine, and B. G. Mendonca, "The Proportion of .
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22. H. J. Simpson, "Aerosol Cations at Mauna Loa Observatory,'' J. Geophys. Res.
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25. "Report of ICRP Committee II on Permissible Dose for Internal Radiation (1959), "'
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26.

J. W. Healy, Surface Contamination:

.
Decision Levels, Los Alamos Scientific

Laboratory, Rept. LA-4558-MS (1971),

£44-30

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