168 · ARL Annual Salary Survey 2014–2015 NATIONAL LIBRARYy OF MEDICINE The significant increase in professional staff is due to the first federal pay increase in three years. NEW YORK PUBLIC Library branches included: Library for the Performing Arts Library Services Center Schomburg Center Science, Industry, and Business Library and the Stephen A. Schwarzman Building. SMITHSONIAN Smithsonian Institution Libraries has a total of 20 libraries located throughout the museums and research institutes of the Smithsonian Institution. 1. National Air and Space Museum Library, Washington, DC 2. National Museum of American History, Washington, DC 3. National Museum of Natural History Library, Washington, DC 4. National Postal Museum Library, Washington, DC 5. National Zoological Park Library, Washington, DC 6. Smithsonian American Art Museum, National Portrait Gallery Library, Washington, DC 7. Smithsonian Environmental Research Center Library, Edgewater, Maryland 8. Anacostia Museum and Center for African American History and Culture Library, Washington, DC 9. Botany and Horticulture Library, Washington, DC 10. Cooper-Hewitt National Design Museum Library, New York, New York 11. Dibner Library of the History of Science and Technology, Washington, DC 12. Earl S. Tupper Library Smithsonian Tropical Research Institute, Republic of Panama 13. Freer Gallery of Art and Arthur M. Sackler Gallery Library, Washington, DC 14. Hirshhorn Museum and Sculpture Garden Library, Washington, DC 15. John Wesley Powell Library of Anthropology, Washington, DC 16. Joseph F. Cullman, 3rd Library of Natural History, Washington, DC 17. Museum Studies and Reference Library, Washington, DC 18. Museum Support Center Library, Suitland, Maryland 19. Vine Deloria Jr. Library, National Museum of the American Indian, Suitland, Maryland 20. Warren M. Robbins Library, National Museum of African Art, Washington DC