Subject
Geology
3
History
2
Paleobotany
2
African Americans
1
Aquatic plants
1
Black race
1
Cartography
1
Choctaw Indians
1
Clay
1
Dicotyledons
1
Geology, Stratigraphic
1
Gold mines and mining
1
Groundwater
1
Identification
1
Indians of North America
1
Intellectual life
1
Limestone
1
Marsh ecology
1
Mines and mineral resources
1
Physicians
1
Racism
1
Science
1
Social life and customs
1
Swamps
1
Trees
1
Wetland plants
1