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Even though the determination of the presence of wetlands should be left to professionals, it could help to at least be familiar with the topic of wetlands in the event that you are told that your property contains this kind of area. Finding out some information about wetlands could allow a better understanding of what goes into the actual determination of the wetlands boundaries in your site.
The following are two books that I would recommend.
1) Wetland Indicators by Ralph W. Tiner
This is a good guide that shows you what field information is used to determine the presence of wetlands areas.
2) Wetland Soils by Michael J. Vepraskas and Christopher B. Craft
This book discusses the characteristics of the ground associated with wetlands.