US Forest Service imakutsutsani kuti mutuluke panja ndikujambula zithunzi za nkhalango zakutawuni kapena zadera lanu. Mutha kupambana $200 mu zida zakunja kuchokera ku National Forest Foundation.
Kuti muwerenge malamulo onse ampikisano kapena kutumiza chithunzi, pitani ku urbanforest.challenge.gov.