Cass Gilbert Minnesota, and the Library of Congress. Cass Gilbert is often confused with Charles Pierrepont Henry Gilbert, another prominent architect of the time. Cass Gilbert designed the famous Woolworth Building skyscraper on Broadway for Frank W. Woolworth, while Woolworth's personal mansion was designed by C. P. H. Gilbert. The Ukrainian Institute building on Manhattan's 5th Avenue is the work of C. P. H. Gilbert, and often incorrectly attributed to Cass Gilbert. Cass Gilbert should also not be confused with his son, architect Cass Gilbert, Jr. Notes Further reading Cass Gilbert Cass Gilbert (November 24, 1859 – May 17, 1934) was a
Lewis Cass Its purpose was to map the region and locate the source of the Mississippi River. The headwater of the great river was then unknown, resulting in an undefined border between the United States and British North America, which had been linked to the river. The Cass expedition erroneously identified what became known as Cass Lake as the Mississippi's source. It was not until 1832 that Henry Rowe Schoolcraft, the Cass expedition's geologist, identified nearby Lake Itasca as the headwater of the Mississippi. On August 1, 1831, Cass resigned as governor of the Michigan Territory to take the post of Secretary