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The important advantage of middle-digit filing in comparison to straight numeric filing is its almost perfect distribution of folders throughout the entire system. This makes it possible to place responsibility for accuracy in filing on the clerk assigned

Reference: 
p. 124
Citation Text: 

The important advantage of middle-digit filing in comparison to straight numeric filing is its almost perfect distribution of folders throughout the entire system. This makes it possible to place responsibility for accuracy in filing on the clerk assigned to a specific section. It also eliminates the queuing or congestion that occurs with straight numeric arrangements, which tend to concentrate file activity in the most recent or higher sequential order.

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