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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. An updated version of the Aerodist Years which has been reformatted and had various typographical errors removed is now available at this link. Karen McLean who prepared this update has also prepared an Epub version of the Aerodist Years which is available at this link. If the downloaded file is clicked it opens in the Microsoft Edge browser, however if needed a free Epub viewer can be downloaded from this link.