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  • Heliograph: Frontier Arizona’s Communication by Sunlight

    Oro Valley Public Library 1305 W Naranja Dr, Oro Valley, AZ, United States

    Join the Oro Valley Historical Society as we hear from retired CIA Intelligence Analyst, Lee Krsiean, an Oro Valley neighbor, talk about early communication way before texting!  The presentation is free, and donations to the Oro Valley Historical Society are most welcome. Communication across long distance using reflected light signals, probably was used by pre-Columbian […]

    Free