- 12th August is Celebrated as National Librarian’s Day in India.
- “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.”
- 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
- • 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.

| Books by S.R. Ranganathan | Publication Year |
| The Five Laws of Library Science | 1931 |
| Colon Classification | 1933 |
| Classified Cataloguing Code | 1934 |
| Prolegomena to Library Classification | 1937 |
| Prolegomena to Library Classification (2nd ed.) | 1957 |
| Prolegomena to Library Classification (3rd Ed.) | 1967 |
| Classification and Communication | 1951 |
| Documentation: Genesis and Development | 1973 |
| Documentation and its facets | 1963 |
| Reference Service | 1961 |
| Library Book Selection | 1952 |
| Library Book Selection (2nd ed.) | 1966 |
| Philosophy of Library Classification | 1951 |
| Library Administration | 1935 |
| Library Manual | 1951 |
| Ramanujan: The man and the mathematician | 1967 |
| Suggestion for the organization of the Libraries in India | 1946 |
| Heading and Canons | 1955 |
| 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 |


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