https://midnight-book-reader.blogspot.com/2024/06/the-john-callahan-series-sale-blitz-and.html
Midnight Book Reader: The John Callahan Series - Sale Blitz and Giveaway
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https://lehighvalleyramblings.blogspot.com/2009/12/nrccs-christmas-card-to-john-callahan.html
Lehigh Valley Ramblings: NRCC's Christmas Card to John Callahan
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https://archives.dc.gov/Documents/Detail/callahan-mary-to-leary-john/17765
CALLAHAN, Mary to LEARY, John - Office of the Secretary - DC Office of Public Records and Archives
CALLAHAN, Mary to LEARY, John, CALLAHAN, Mary, LEARY, John, Marriage Bureau, marriage, English
office of the secretary