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- [7] EIGHTEENTH PANAMERICAN HEALTH CONFERENCE - TWENTY-SECOND MEETING OF REGIONAL COMMITTEE OF WHO BOLETIN DE LA OFICINA SANITARIA PANAMERICANA, 1970, 69 (06): : 540 - &
- [8] TWENTY-SECOND INTERNATIONAL GEOLOGICAL CONGRESS JOURNAL OF SCIENTIFIC & INDUSTRIAL RESEARCH, 1965, 24 (08): : 393 - &