World literature on patents (1900-1981) / National Seminar on Patents Systems Regional Research Lanoratory 28-29 November 1981 - Hyderabad: National Seminar on Patents Systems Regional Research Lanoratory, 1981 - 204p. Subjects--Topical Terms: Bibliography Subjects--Index Terms: Chemical abstracts Universal Decimal Class. No.: R 016:608.3 / M2