Title: Correspondence
Subjects: Correspondence, Plants, Botanical specimens, Plant collecting, United States, Pacific railroads, Exploration and surveys, Aquatic plants, Astronomy, Discovery and exploration
Places: United States, West (U. S.), New Southwest
People: George Engelmann (1809-1884), C. C. Parry (1823-1890), Amiel Weeks Whipple (1817-1863), John M. Bigelow (1804-1878)