Wetlands :  losses in the United states 1780's to 1980's / 
Thomas E. Dahl. 
 - Washington, D.C. :  Department of Interior, Fish and Wildlife Service,  1990. 
 - iv, 13 p. :  ill. ;  28 cm. 
<br/><br/><label>ISBN: </label> Hadiah 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Wetland conservation--United States.<br/>Wetlands--United States.<br/>Wildlife conservation--United States.