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Updated: May 14, 2025
In an old, well-elaborated river system swamps are commonly absent, or, if they occur, are due to local accidents of an unimportant nature. For our purpose swamps may be divided into three groups climbing bogs, lake bogs, and marine marshes. The first two of these groups depend on the movements of the rain water over the land; the third on the action of the tides.
The originality may be in a method of investigation; it may be in the use of some hitherto inaccessible or unprinted material; it may be in the employment of some sources of information open to everybody, but not before used, or it may be in a fresh combination of well-known and well-elaborated facts. It is this last-named feature that leads Mr.
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