The personal archive of Lauro Pereira Travassos Filho (1918 is in the collection of the Memory Center of the Butantan Institute. The main objective of this work is to conduct a study on personal files of scientists and the organization of archival information. As a methodology, the representation of the Personal Fond of Lauro Travassos Filho involved technical archival processes of document typology and archival description, bibliographic consultation, document research, oral history, and exploratory analysis of description standards. We first perform a literature review of personal archives and personal archives of scientists to insert the object of the work into the field of discussions in the area. We address the contextualization of the documental production of entomology and parasitology, looking at the challenges in these areas, the institutionalization of these fields of knowledge at the Butantan Institute, and the professional development of Lauro Travassos Filho, and the documents that these fields of scientific knowledge production. We discussed archive organization and representation processes, archival classification and description, description standards, and their application in the universe of scientists' archives. We conclude that the document description and classification plan perform information retrieval through language qualification, in processes of synthesis, generalization, grouping, and elimination of terms. In the personal fond of Pessoal de Lauro Travassos Filho, we understand that the information organizing system is necessarily based on the functions and activities developed by its producer, which gives significance to the sets of documents, placed organically and uniquely. When addressing archival description standards we saw that while they are crucial guiding principles, they can be enhanced in the case of scientist archives by fields that qualify the information included therein.