1. 12th August is Celebrated as National Librarian’s Day in India.
  2. “August 12th is being celebrated as National Librarian’s Day in India, in remembrance of national professor of library science, Dr S R Ranganathan (1892-1972), who had spearheaded library development in India.”
  3. Dr. S R Ranganathan (1892-1972) Ranganathan, born on 9 August 1892( but it is mentioned as 12th August in many books), came from a moderate background in British- ruled India. He was born in the small town of Shiyali (now known as Sirkazhi), in the state of Tamil Nadu in southern India. Ranganathan began his professional life as a mathematician; he earned B.A. and M.A. degrees in mathematics from Madras Christian College in his home province, and then went on to earn a teaching license
  4. • His lifelong goal was to teach mathematics, and he was successively a member of the mathematics faculties at universities in Mangalore, Coimbatore and Madras (all within the span of five years). As a mathematics professor, he published a handful of papers, mostly on the history of mathematics. His career as an educator was somewhat hindered by a handicap of stammering (a difficulty Ranganathan gradually overcame in his professional life). The Government of India awarded Padmashri to Dr. S.R. Ranganathan for valuable contributions to Library Science.
COURTESY:LIBRARY SCIENCE.IN

Books by S.R. RanganathanPublication Year
The Five Laws of Library Science1931
Colon Classification1933
Classified Cataloguing Code1934
Prolegomena to Library Classification1937
Prolegomena to Library Classification (2nd ed.)1957
Prolegomena to Library Classification (3rd Ed.)1967
Classification and Communication1951
Documentation: Genesis and Development1973
Documentation and its facets1963
Reference Service1961
Library Book Selection1952
Library Book Selection (2nd ed.)1966
Philosophy of Library Classification1951
Library Administration1935
Library Manual1951
Ramanujan: The man and the mathematician1967
Suggestion for the organization of the Libraries in India1946
Heading and Canons1955
A Librarian Looks Back: An autobiography of Dr. S. R. Rangnathan (Editor: P. N. Kaula)1992 
Colon Classification (1 ” ed.)1933
Colon Classification (2nd ed.)1939
Colon Classification (3rd ed.)1950
Colon Classification (4h ed.)1952
Colon Classification  (5th ed.)1957
Colon Classification (6th ed.)1960