[Papers] : seminar on pollution and productivity, 14th November, 1973.
[Papers] : seminar on pollution and productivity, 14th November, 1973.
- (S.l. : s.n.) ; 1973.
- 1v. (various pagings).
Pollution-- Measurement -- Congresses.
Pollution -- International cooperation.
Pollution-- Measurement -- Congresses.
Pollution -- International cooperation.
