TY  - GEN
AU  - Hawksworth, David L
AU  - Rose, Francis
TI  - Lichens as pollution monitors
T2  - Studies in Biology, No.66
SN  - 0713125551
U1  - 589.1045 
PY  - 1976///
CY  - London
PB  - Edward Arnold
KW  - BOTANY
ER  -