Depth classification and reference service & reference material : papers for discussion at the tenth All-India Library Conference, Hyderabad, 1-4 June 1953 / Ranganathan, S. R. All India Library Conference (10th :, 1953 : Hyderabad, India) Classification Books. Reference services (Libraries) 025 RAD Includes index. Delhi : Indian Library Association, 1953. 1953. 1953 Text 444 p. ; eng English series ; 6 English series (Indian Library Association) ; 6.