The collection consists of personal letters and postcards from Gertrude Calder, her sister Helen, her aunt Mary Ann, and her great-aunt Mary Ann, from Alex Calder and his wife Catherine Rogers, and from other relatives and friends in Louisiana, Texas, the eastern United States, and Scotland. There are letters referring to a smallpox epidemic in Mermentau, Acadia Parish, Louisiana in 1900 and a 1905 yellow fever epidemic in New Orleans.
The collection also contains materials received primarily by Gertrude Calder from the Sacred Heart of Jesus Church in New Orleans, the Archdiocese of New Orleans, and various charitable orders of the Roman Catholic Church in the United States.
Box 1: Correspondence, 1868-1910
Box 2: Correspondence, 1911-1956
Box 3: Correspondence; other papers, bills and receipts, 1957-1961; 1886-1957
Box 4: Postcards and greeting cards, circa 1905-1945
Box 5: Religious material, 1934-1962, undated
Box 6: Religious material, 1928-1961
Box 7: Religious materials, 1911-1961