IND-IIA-F013-I45
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Item
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17-02-1976
Part of Official and personal files of M. K. Vainu Bappu
This letter was about spectroheliograms that Saxenas sent to him. He suggested to improve on this by another factor of 200%. He explains his idea to work on spectroheliogram.
Vainu Bappu, M. K.