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This paper describes the study made of mortars used in the Castillo de San Felipe del Morro in San Juan, Puerto Rico. Through a multi-disciplinary approach, combining examination of materials in situ and in the laboratory with a study of archival documents, a relatively simple system of categories was devised. Mortars were grouped into three categories based on overall color and composition: red/beige, white, and brick-dust. The information gleaned in this study served as a basis for a condition assessment and will be used for developing replacement mortars. [ABSTRACT FROM AUTHOR]