![]() Image Number K9960-1 |
Hydraulic engineer David Goodrich examines cottonwood leaves for signs of water stress in the San Pedro Riparian National Conservation Area.
Photo by Peggy Greb.
![]() Image Number K9960-1 |
Hydraulic engineer David Goodrich examines cottonwood leaves for signs of water stress in the San Pedro Riparian National Conservation Area.
Photo by Peggy Greb.