TY  - JOUR
A1  - Duhl, T R
A1  - Guenther, A 
A1  - Helmig, D 
T1  - Estimating urban vegetation cover fraction using Google Earth® images.
Y1  - 2012/09/
N1  - R831079
JF  - JOURNAL OF LAND USE SCIENCE
VL  - 7
IS  - 3
SP  - 311
EP  - 329
ER  - 


TY  - JOUR
A1  - Ortega, J 
A1  - Helmig, D 
T1  - Approaches for quantifying reactive and low-volatility biogenic organic compound emissions by vegetation enclosure techniques--Part A.
Y1  - 2008/06/
N1  - R831079
JF  - CHEMOSPHERE
J1  - CHEMOSPHERE
VL  - 72
IS  - 3
SP  - 343
EP  - 364
ER  - 


TY  - JOUR
A1  - Sakulyanontvittaya, T 
A1  - Guenther, A 
A1  - Helmig, D 
A1  - Milford, J 
A1  - Wiedinmyer, C 
T1  - Secondary Organic Aerosol from Sesquiterpene and Monoterpene Emissions in the United States.
Y1  - 2008/12/1
N1  - R831079
VL  - 42
IS  - 23
SP  - 8784
EP  - 8790
ER  -