1
by Elliott, George V.
Published October 20, 1981
...U.S. Fish and Wildlife Service (FWS)...
Link to full text
2
by Konkel, Gregory W.
Published July 1981
...U.S. Fish and Wildlife Service (FWS)...
Link to full text
3
Published February 2012
...U.S. Fish and Wildlife Service (FWS)...
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4