The Mahatma Letters to A.P. Sinnett was created in 1923.
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Margaret Guild Conger has written:
'Combined chronology for use with The Mahatma letters to A. P.
Sinnett and The letters of H. P. Blavatsky to A. P. Sinnett' --
subject(s): The Mahatma letters to A. P. Sinnett