Forstall seems to have taught algebra, geometry, and physics. These are his bound notebooks, in French, perhaps used for teaching.
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A.W. Forstall, SJ, papers, GTMGamms37, Georgetown University Library Booth Family Center for Special Collections, Washington D.C. https://findingaids.library.georgetown.edu/repositories/15/resources/10265 Accessed July 02, 2020.