The Saturn IB-A was a proposed Saturn I family variant but was never built. It was to be a three-stage rocket virtually identical in layout to the Saturn IB-CE, with upgraded H-1 engines and a stretched S-IVB stage.
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This article is an automated import of the Wikipedia article "Saturn IB-A", available at https://en.wikipedia.org/wiki/Saturn_IB-A . Text is licensed under CC BY-SA 4.0.