This letter mentions Dr.M. K. Vainu Bappu has been elected the President of the IAU for the term 1979-1982, followed by Bappu's distinguished life since his education from Hyderabad to Harvard and his contributions, awards, honours and leadership at national and international levels.

This letter concerns the role of astronomy. The contribution of astronomy to scientific development and the significant achievements and its continuous efforts.

This letter was about Kodaikanal Observatory's position & surroundings and also talks about scientific celebrities contribution and visits of Dr. Homi Bhabha, Dr. S. Chandrasekhar.

This fond contains letters, several photographs, and observations related to A. A Narayana Ayer during the year 1913-1920.

This fond contains official letters, photographs, and administrative files related to P. R. Chidambara Ayer during the years 1919-1932.

The font contains letters, correspondence, life, achievements and participation at National and International level of Dr.M. K. Vainu Bappu

The letter is to The District Medical & Sanitary Officer, Madura, from the Director of Kodaikanal Observatory requesting to examine A. Y. Subrahmanya Aiyer and certify his fitness for entertainment in the public service as the third assistant of the Solar Physics Observatory, Kodaikanal.

This letter was conveying Dr.M. K. Vainu Bappu to congratulating him on the government's decision to award him the Shanti Swarup Bhatnagar Prize for his contributions to physical sciences in 1970.

This letter from W. Huggins to John Evershed regarding approval of paper presentation

The letter is from Thomas Royds, assistant Director of Kodaikanal Observatories, to the editors of the astrophysical journal regarding a paper. It states that the manuscript of the paper on "The different character of spectrum lines belonging to the same series for its publication in the astrophysical journal.