Subject Region
United States
49
Great Britain
7
Australia
6
Canada
5
Baltimore
3
China
3
Europe
3
Maryland
3
California
2
Espana
2
Mexico
2
Spain
2
Africa, Sub-Saharan
1
Appalachian Region
1
Argentina
1
Brazil
1
British Columbia
1
Chicago (Ill.)
1
Chiloé (Chile)
1
France
1
Hong Kong
1
Iran
1
Kansas
1
Las Vegas
1
Las Vegas (Nev.)
1
Leavenworth
1
Mekong River Watershed
1
Nevada
1
New York
1
New York (N.Y.)
1
New York (State)
1
North America
1
Northwest, Pacific
1
Ontario
1
Shanghai
1
Shanghai (China)
1
Thamesville
1
Trinidad and Tobago
1
Vancouver
1