The Posner Memorial Collection of six hundred twenty-two titles includes landmark titles of the history of western science, beautifully produced books on decorative arts and fine sets of literature. Mr. Henry Posner, Sr. formed the collection from 1924 to 1973, starting with literature and decorative arts and, after 1950, focusing on the history of science.

When possible, books are in electronic format with text and images and accompanied by a Collector's File of Mr. Posner's records.