R. O. B. Wijesekera

1138407798 / 9781138407794

R. O. B. Wijesekera / C. M. Ratnatunga / Klaus Kürbeck

OCLC:174180532

R. O. B. Wijesekera

9556715053 / 9789556715057

Scientists

A. Tcheknavorian-Asenbauer / R. O. B. Wijesekera / UNIDO (Vienna). / United Nations Industrial Development Organization, Pharmaceuticals Industries Unit, Division of Industrial Operations, Chemical Industries Branch / United Nations Industrial Development Organization. Pharmaceutical Industries Unit

OCLC:123423439

Aromatic plants

G. D. Kelkar / R. O. B. Wijesekera / Consultative Mission on Essential Oil Industry / United Nations Economic and Social Commission for Asia and the Pacific

OCLC:254888920