Wetlands of the California Central Valley :  status and trends 1939 to mid-1980's / 
W. E. Frayer, Dennis D. Peters, and H. Ross Pywell 
 - Portland, Oregon :  U.S. Fish and Wildlife Service,  1989 
 - 28 p. :  ill. ;  28 cm. 
<br/><br/><label>ISBN: </label> Hadiah 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Wetland plants--California<br/>Wetlands--California<br/>Wetland conservation--California