IND-IIA-F013-I17
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Item
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24-11-1972
Part of Official and personal files of M. K. Vainu Bappu
This letter was about sending a complimentary copy of their film, "Coronal Events". It shows most of the marked coronal activity recorded at Sacramento Peak Observatory by Howard DeMastus since 1956.
Vainu Bappu, M. K.