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The tree BVOC index.
Simpson JR, McPherson EG. Simpson JR, et al. Among authors: mcpherson eg. Environ Pollut. 2011 Aug-Sep;159(8-9):2088-93. doi: 10.1016/j.envpol.2011.02.034. Epub 2011 Mar 23. Environ Pollut. 2011. PMID: 21435760
Monitoring urban forest health.
McPherson EG. McPherson EG. Environ Monit Assess. 1993 Jul;26(2-3):165-74. doi: 10.1007/BF00547494. Environ Monit Assess. 1993. PMID: 24220831