This article examines a selection of the professional and private letters of the Harvard-Irish Survey (1930-1936). These letters contribute to the historiography of the first visit to Europe in the 1930s of an American team of anthropologists and archaeologists engaged in a multi-disciplinary study of a “modern” society. How letters are deployed, who writes to whom, what is relayed, requested or refused reveals the deployment of a novel research strategy by anthropologists Arensberg and Kimball. Letters to and from research informants reveal not only the anthropologists’ requests but informant voices, perspectives and practices – material that informs ethnographic observations on Irish town and country life. The complexities of informant-researcher relationships are highlighted. A narrative approach to the analysis of research letters is introduced.