Correspondence, diaries, notebooks, lectures, articles, essays, genealogical materials, photographs and other papers of William Henry Brewer, scientist, teacher, and writer.The collection spans Brewer's entire career including his student days at the Yale Analytical Laboratory, his work with the California State Geological Survey, his various teaching positions in California, New York and at Yale and all his other many and varied activities. Of special and specific interest are Brewer's letters to members of his family which chronicle his many trips and scientific expeditions, his correspondence with his colleagues, and the methodical and voluminous notes and diaries he kept on virtually everything he did or encountered.