CRANV2 Aslib Cranfield Research Project: Factors Determining the Performance of Indexing Systems: Volume 2 title page title page Cyril Cleverdon Michael Keen Cranfield An investigation supported by a grant to Aslib by the National Science Foundation. Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. ASLIB CRANFIELD RESEARCH PROJECT FACTORS DETERMINING THE PERFORMANCE OF INDEXING SYSTEMS VOLUME 2 Cyril Cleverdon and Michael Keen An investigation supported by a grant to Aslib by the National Science Foundation Cranfield 1966