| [CORRESPONDENCE] FROM: WILLIAM A. CASTLE; TO: MISS MARY CASTLE; REGARDING: TRIP |
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| [CORRESPONDENCE] FROM: WILLIAM A. CASTLE; TO: FAMILY; REGARDING: TURKEY |
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| [CORRESPONDENCE] FROM: WILLIAM A. CASTLE; TO: FAMILY; REGARDING: TRIP THROUGH THRACE AND BULGARIA |
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| [CORRESPONDENCE] FROM: WILLIAM A. CASTLE; TO: FAMILY; REGARDING: THURSDAY AFTERNOON |
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| [CORRESPONDENCE] FROM: WILLIAM A. CASTLE; TO: FAMILY; REGARDING: SOFIA |
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| [CORRESPONDENCE] FROM: WILLIAM A. CASTLE; TO: FAMILY; REGARDING: GENERAL CHAMBERLAIN |
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| [CORRESPONDENCE] FROM: WILLIAM A. CASTLE; TO: FAMILY; REGARDING: CONSTANTINOPLE |
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| [CORRESPONDENCE] FROM: UNKNOWN; TO: UNKNOWN; REGARDING: WILLIAM CASTLE HUMMEL |
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| [CORRESPONDENCE] FROM: UNKNOWN; TO: UNKNOWN; REGARDING: UNMAILED LETTERS |
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| [CORRESPONDENCE] FROM: UNKNOWN; TO: UNKNOWN; REGARDING: CONSTANTINOPLE |
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| [CORRESPONDENCE] FROM: UNKNOWN; TO: UNKNOWN; REGARDING: (UNABLE TO TRANSLATE) |
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| [CORRESPONDENCE] FROM: UNKNOWN; TO: UNKNOWN; REGARDING: (UNABLE TO TRANSLATE) |
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| [CORRESPONDENCE] FROM: UNKNOWN; TO: UNKNOWN; REGARDING: (UNABLE TO TRANSLATE) |
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| [CORRESPONDENCE] FROM: UNKNOWN; TO: UNKNOWN; REGARDING: (UNABLE TO TRANSLATE) |
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| [CORRESPONDENCE] FROM: UNKNOWN; TO: PRINCE; REGARDING: TWO LITTLE DOLLS |
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| [CORRESPONDENCE] FROM: UNKNOWN; TO: PRINCE; REGARDING: MARY'S LETTERS |
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| [CORRESPONDENCE] FROM: UNKNOWN; TO: MRS. HELEN BRISTEL; REGARDING: GENERAL GOULKEVITCH |
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| [CORRESPONDENCE] FROM: UNKNOWN; TO: MR. RAVNDAL; REGARDING: MY LITTLE ODYSSEY |
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| [CORRESPONDENCE] FROM: UNKNOWN; TO: MILES; REGARDING: THE ADMIRAL |
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| [CORRESPONDENCE] FROM: UNKNOWN; TO: LIEUTENANT COLONEL WILLIAM A. CASTLE; REGARDING: SEE YOU AGAIN? |
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