TY  - GEN
AU  - Harper, John L
TI  - Biology of weeds : a symposium of the British ecological society, Oxford, 2nd - 4th Aptril, 1959
U1  - 632.58 HAR 
CY  - Oxford, Blackwell scientific publications
KW  - Weed science - great  Britain - congresses/ weed control - great Britain - congresses
ER  -