Topic
Key words
Ursus maritimus
4
polar bear
4
Alaska
2
Arctic National Wildlife Refuge
2
National Petroleum Reserve – Alaska
2
Prudhoe Bay
2
den habitat
2
maternal den
2
ANWR
1
Arctic
1
North Slope
1
aerial photography
1
behavior
1
den emergence
1
denning
1
disturbance
1
impact
1
maternity den
1
oil development
1
photo interpretation
1
reproduction
1