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==== APLDOT modeling language ==== An example of an early "industrial weight" spreadsheet was APLDOT, developed in 1976 at the [[United States Railway Association]] on an IBM 360/91, running at The Johns Hopkins University Applied Physics Laboratory in Laurel, MD.<ref>[http://portal.acm.org/citation.cfm?id=390005.801196 portal.acm.org] β APLDOT</ref> The application was used successfully for many years in developing such applications as financial and costing models for the US Congress and for [[Conrail]]. APLDOT was dubbed a "spreadsheet" because financial analysts and strategic planners used it to solve the same problems they addressed with paper spreadsheet pads.
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