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DUGGER WM, 1963, JAPCA-INT J AIR POLL, V13, P423
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HECK WALTER W., 1965, J AIR POLLUT CONTR ASS, V15, P511
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HECK WW, 1968, APTD686 NAT AIR POLL
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HECK WW, 1967, JAPCA-INT J AIR POLL, V17, P112
[8]
MENSER HA, 1962, THESIS U MARYLAND