[The development and growth of city directories, A. V. Williams. Williams directory Company, 1913.
Source: Google Books. Original from the New York Public Library]
I'm including his section on Philadelphia's city directories in its entirety as a sample of his style. Because the Philadelphia lead the way, Mr Williams devotes more space to it than most other U.S. cities.
My original post is here; the book is available as a free e-book here.
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