This collection contains at least 18 diaries spanning more than thirty-five years (1917-1954) of unusual diaries available as both loose pages (contained in 5 folders) and traditional notebooks (11 bound volumes). Maintained by crystallographer Rose Mooney-Slater, these records offer insights into her graduate education at Tulane University and the University of Chicago, Guggenheim Fellowship in Europe on the eve of World War II, and noteworthy career during the postwar period. Alongside many rich ancillary materials--such as a Friendship Book with numerous photographs from 1914-17--Mooney-Slater's diaries provide detailed information about her personal and professional life. Of particular note is a diary describing her aborted Guggenheim Fellowship in Holland at the outset of World War II, as excerpted in Selected Quotations (9/1/1939). With the outbreak of war, Mooney-Slater cuts short her fellowship and books passage back to the United States as others rush to leave Europe. Early diaries provide glimpses into her struggles to balance marriage with graduate education (1928-29) and later diaries document her wide-ranging professional travels during the postwar period, including trips to Europe in both 1951 and 1954. Unfortunately, many of these volumes are water-damaged, and it can be challenging to trace the chronology of materials in folders (particular items in the 1917-1952 folder). However, scholars willing to take the time to peruse these records will be richly rewarded with insights into twentieth-century science, the postwar research university, and the inner life of a remarkable female scientist.