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vls/2603nrwcece.visuallibrary.netvdPractical researchplanning and designLeedy, Paul D.auttextbookNew YorkMacmillan19802. ed.monographic270 S.0-02-369230-8HT004677907361QC265 L484(2)19931219062840801 https://ce.visuallibrary.net//domainresource/static/graphics/connectors/viewerLogo.gif http://193.30.112.129:83/F/?func=find-c&ccl_term=ICS%3D062840801+X0001 https://ce.visuallibrary.net/id/70455 https://ce.visuallibrary.net/i3f/v20/70455/manifest https://ce.visuallibrary.net/proto_ftsearch/70455