The Entomology Research Museum contains more than three million insect specimens, with particular strengths in Hymenoptera, Chalcidoidea, Aphelinidae, Thysanoptera and Meloidae. The UCR/California Museum of Photography and Sweeney Art Gallery house UCR's primary art collections. The UCR/CMP includes the world's largest holding of vintage stereographs, one of the three great public collections of photographic apparatus in the US, and the University Print Collection of contemporary and historical images by over 1000 photographers. Located adjacent to the UCR/CMP, the Sweeney Art Gallery holds approximately 650 unique works, with especially strong collections from the modern to contemporary periods, including pieces by Alexander Calder, Roy Lichtenstein, Millard Sheets and Kara Walker.