Drs. Dan Richter, r, and Michael Hofmockel, l, examine the historic Calhoun Soil Archive

Drs. Dan Richter, r, and Michael Hofmockel, l, examine the Calhoun Soil Archive

Drs. Dan Richter, r, and Michael Hofmockel, l, examine the historic Calhoun Soil Archive. Photo courtesy of LTSE.

Photo courtesy of: 
LTSE
From: 
Long-Term Soil Observatories team up