Mechanism of the Post Office, Francis B. Head, The Quarterly Review,
Jun. 1850, vol. 87, pp. 69-115.
http://books.google.com/books?id=4m8JAAAAQAAJ
[excerpt, p. 115]
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See also, The London Quarterly Review, American edition, Jul. 1850,
vol. 87, pp. 37-62.
http://books.google.com/books?id=hZApAAAAYAAJ