Subject- Natural history.
(77)
- Botany.
(37)
- Indians of North America -- Languages
(29)
- Medicine.
(28)
- Astronomy.
(24)
- Indians of North America
(21)
- Voyages and travels.
(21)
- Slaves, slavery, slave trade
(16)
- Delaware Indians
(15)
- Geology.
(15)
- Abolition, emancipation, freedom
(14)
- Meteorology -- Observations.
(13)
- Chemistry
(12)
- Anishinaabe
(11)
- Science -- Societies, etc.
(11)
- Zoology.
(11)
- Agriculture
(10)
- Iroquois Indians
(9)
- Paleontology.
(9)
- Commerce.
(8)
- Exploration
(8)
- Mathematics.
(8)
- Mayan languages
(8)
- Ojibwa Indians
(8)
- Ornithology.
(8)
- Social conditions, social advocacy, social reform
(8)
- American Philosophical Society
(7)
- Cherokee Indians
(7)
- Choctaw Indians
(7)
- Land speculation
(7)
- Mineralogy.
(7)
- Natural history
(7)
- Ojibwe people
(7)
- Plants -- Collection and preservation.
(7)
- Science.
(7)
- Slavery -- United States.
(7)
- Botany
(6)
- Cakchikel language
(6)
- Eclipses.
(6)
- Indians of North America -- Treaties
(6)
- Learned institutions and societies.
(6)
- Louisiana Purchase -- Discovery and exploration.
(6)
- Meteorology.
(6)
- Mineralogy
(6)
- Physics.
(6)
- Scientific apparatus and instruments.
(6)
- Seneca Indians
(6)
- Stamp Act, 1765
(6)
- United States -- History -- Revolution, 1775-1783
(6)
- Agriculture -- United States.
(5)
- Algonquin language
(5)
- Birds.
(5)
- Chickasaw Indians
(5)
- Delaware language
(5)
- Education
(5)
- Electricity
(5)
- Electricity -- Early works to 1850.
(5)
- Evolution (Biology)
(5)
- Geometry.
(5)
- Horticulture.
(5)
- Indians of North America -- Government relations
(5)
- Physicians
(5)
- Race, race relations, racism
(5)
- Real property -- Pennsylvania.
(5)
- Science and technology
(5)
- Slavery -- Pennsylvania.
(5)
- Weights and measures.
(5)
- Animal magnetism.
(4)
- Architecture
(4)
- Astronomy -- 18th century
(4)
- Botany -- England.
(4)
- Brandywine, Battle of, 1777
(4)
- Creek Indians
(4)
- Education -- United States.
(4)
- Electricity.
(4)
- Entomology.
(4)
- Evolution.
(4)
- Geology
(4)
- Germantown, Battle of, 1777
(4)
- Indians of North America -- Missions
(4)
- Indians of North America -- Pennsylvania
(4)
- Indians of North America -- Social life and customs
(4)
- Linguistics
(4)
- Linguistics.
(4)
- Medicine -- Study and teaching.
(4)
- Mesmerism
(4)
- Military history, Modern -- 18th century.
(4)
- Mollusks.
(4)
- Osage Indians
(4)
- Paleontology
(4)
- Pennsylvania -- History -- Colonial period, ca. 1600-1775
(4)
- Pharmacology.
(4)
- Philology.
(4)
- Phrenology.
(4)
- Physics -- Early works to 1800
(4)
- Plains Indians
(4)
- Plantations
(4)
- Religion
(4)
- Scientific expeditions.
(4)
- Scientists -- Great Britain.
(4)
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