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	1.		Documentation and information retrieval: An introduction basic principles and cost analysis by Perry, J W Kent, Allen Material type: Text; Format: print ; Literary form: Not fiction Publication details: Ohio: Ther Press of Western Reserve University and Interscience Publishers, Inc. 1957 Availability: Items available for loan: National Science Library (1)Call number: D 002 J7. Place hold Add to cart (remove)
	2.		Measure of overlap in classification system /Third international study conference on classification research Bombay January 1975 by Hoyle, W G Material type: Text; Format: print ; Literary form: Not fiction Publication details: Ottawa: National Research Council of Canada Availability: Items available for loan: National Science Library (1)Call number: D 025.4(082.2) L9. Place hold Add to cart (remove)
	3.		Development and use of patent classification systems by Connor, John T Material type: Text; Format: print ; Literary form: Not fiction Publication details: Washington, D. C.: Patent Office United States of America, 1966 Availability: Items available for loan: National Science Library (1)Call number: D 025.4:608.3 K6 . Place hold Add to cart (remove)
	4.		International classification system for physics The working group in physics of ICSU AB Edition: 2nd ed. Material type: Text; Format: print ; Literary form: Not fiction Publication details: France: International Council of Scientific Unions Abstracting Board, 1978 Availability: Items available for reference: National Science Library: Not for loan (1)Call number: D 025.4:53.001.3=40=30 L8 . Add to cart (remove)