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    The Aerodist airborne distance measuring system was used by Nat Map between 1963 and 1974 to obtain horizontal ground control for the 1:100,000 scale national topographic map series. In 2015 Laurie McLean prepared an extensive article on Nat Map's Aerodist years in consultation with many of the Nat Mappers who were involved in the Aerodist program from up to over half a century ago. The article incorporated many of these Nat Mappers' recollections.
    The web version of the Aerodist Years is available at this link.

    Epub version
    Karen McLean prepared an Epub version of the Aerodist Years which is available at this link (a free Epub viewer can be downloaded from this link).