TY  - RPRT
TI  - Early indications of soil recovery from acidic deposition in U.S. red spruce forests
AU  - Gregory B. Lawrence
AU  - Walter C. Shortle
AU  - Mark B. David
AU  - Kevin T. Smith
AU  - Richard A.F. Warby
AU  - Andrei G. Lapenis
PY  - 2012
DO  - 10.2136/sssaj2011.0415
UR  - https://pubs.usgs.gov/publication/70043701
ID  - 70043701
ER  -