245 10|a A mystery in Alaska.

260 __|a Alexandria, VA: ; |b PBS, |c 2003.

500 __|a Copyright permission expires 07/01/08.

500 __|a Title from web site description.

520 __|a Alaska is home to one of the world's most complex and spectacular ecosystems, and also one of the greatest wildlife mysteries, as many animals decline dramatically in number with no clear explanations why. Against the breathtaking backdrop of magnificent mountains and seacoasts, the film attempts to unravel at least part of the enigma. 60 minutes.

521 __|a Middle school to adult.

546 __|a Closed captioned for the hearing impaired.

651 _0|a Alaska |x Environmental conditions.

650 _0|a Wildlife management |z Alaska |v Documentaries.

710 2_|a PBS

730 0_|a Nature (Television program)

856 42|a http://www.pbs.org/nature/