The title "Les Observatoires Astronomiques" can be translated to Astronomical Observatories. This book consists of astronomical observations from the Royal Observatory of Belgium. It is written by P.Stroobant, E .Delporte, J. Delvosal and F. Moreau, and H. L. Vanderlinden. It is published in 1836

This letter was to replying Dr.M. K. Vainu Bappu for telling the improvements required in the spectra for H & K emission.

This letter was explaining the Saxena's present programme of going to Lucknow.

This letter was concerns a proposal from IAU and seeking Dr.M. K. Vainu Bappu willingness to be a candidate for the Presidency for which the election will take place at the General Assembly in Montreal.

This letter was about Council of the American Astronomical Society, in session at its 160th meeting voted you an Honorary Member of the AAS. Further, Arlo U. Landolt requested Dr.M. K. Vainu Bappu to join with small group of internationally distinguished astronomers and entitled to all the privileges of the Society.

This letter was reply to the Librarian, IIA about sending the photographs of the late Dr.M.K.V. Bappu taken during Regional Meeting on Astronomy in Bandung (August, 1981). In the picture he is shown to shake hand with the then Vice President of the Republic of Indonesia, Mr.Adam Malik.

This letter was to inform that C. V. Raman was greatly obliged for M. K. Vainu Bappu's letter of the 8th July 1954. He got one of the Bausch and Lomb catalogues and was very favourably impressed by it and intend to go ahead and purchase one or more of these gratings for his work.

This letter informs that C. V. Raman received M. K. Vainu Bappu's letter of the 8th instant with much pleasure.

This letter was about M. K. Vainu Bappu got sanctioned a scholarship of £400 per annum for 4 years and that he secured admission to Battersea Polytechnic of the University of London for a course in Electrical Engineering.

This letter was to inform on M. K. Vainu Bappu's research on Sun. It also mentioned finding a location for the Solar Physics Observatory and also asking Bappu for the present address of Zeiss and of Cox, Hargreaves and Thomson.