USAETLUnited States Army Engineer Topographic Laboratories
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The sly reference to "orbital levels" in Livingston's history of the USAETL Field Office reflects the fact that, when it was published in 1992, the entire Corona reconnaissance satellite program (1958-72) was still classified top-secret, although it had ended two decades previously
Impact of the USAETL field office and its predecessors on military mapping research and Development.