 As a result of these and other acquisitions, the library is a significant repository of English imprints from the 16th to 19th centuries and incunabula, including numerous items from the New Haven firm of C. A. Stonehill.The library also began collecting incunabula; by 1950, its collection of pre-1501 imprints numbered nearly 400.The library developed some of its specialties following specific major acquisitions.