| web | http://www.sierraclub.org/sierra/2015-5-september-october/green-life/why-urban-trees-solve-so-many-our-problems?fb_comment_id=fbc_1207918372558395_1215126628504236_1215126628504236#f2e3671b98 |
| author | Catherine Schuknecht |
| publication | Sierra Magazine |
| date | 2015-09-01 |
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