National Bureau of Standards Special Publication 374, METHOD FOR DETERMINING THE RESOLVING POWER OF PHOTOGRAPHIC LENSES, is the Holy Grail for such charts. The Air Force chart is quite adequate but these have been reproduced, generation until generation, so the ones available today are probably twenty or thirty generation copies, with a loss of sharpness at every generation.
The NBS chart included in this Special Publication is printed by the US Mint and is a first-generation product.
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