1. An introduction to the study of natural history: in a series of lectures delivered in the hall of the College of Physicians and Surgeons, New York Author(s): Agassiz, Louis, 1807-1873 Publication: New York : Greeley & McElrath, 1847 Subject(s): Natural HistoryAnimal Population Groups
2. Introductory lecture on natural philosophy Author(s): De Witt, Benjamin, 1774-1819 Publication: New-York : Published by Kirk and Mercein ..., 1818 Subject(s): Natural HistoryPhysics