TY  - RPRT
TI  - δ 13 C values of soil organic matter in semiarid grassland with mesquite ( Prosopis ) encroachment in southeastern Arizona
AU  - Thomas H. Biggs
AU  - Jay Quade
AU  - Robert H. Webb
PY  - 2002
DO  - 10.1016/s0016-7061(02)00227-6
UR  - https://pubs.usgs.gov/publication/70024097
ID  - 70024097
ER  -