Dissanayake, Wimal Sarath Perera, Sunil.
Self environment and communication / Wimal Dissanayake, Sunil Sarath Perera - Colombo Central environment Authority 1991 - 57 p.
Includes references
955912000x
Communication
302.2 / DIS
Self environment and communication / Wimal Dissanayake, Sunil Sarath Perera - Colombo Central environment Authority 1991 - 57 p.
Includes references
955912000x
Communication
302.2 / DIS