#17 Following this, the density of the film is measured on a densitometer and the density noted on its carton, just prior to dispatch.

#17 Following this, the density of the film is measured on a densitometer and the density noted on its carton, just prior to dispatch.

Victory Mail: The WWII Program that Significantly Reduced the Cost and Time of U.S. Military Postal Service

#17 Following this, the density of the film is measured on a densitometer and the density noted on its carton, just prior to dispatch.

WWII

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