TY  - RPRT
TI  - Effect of chronic nitrogen additions on soil nitrogen fractions in red spruce stands
AU  - M.B. David
AU  - A.M. Cupples
AU  - G.B. Lawrence
AU  - G. Shi
AU  - K. Vogt
AU  - P.M. Wargo
PY  - 1998
DO  - 10.1023/a:1005012400047
UR  - https://pubs.usgs.gov/publication/70020849
ID  - 70020849
ER  -