Summarize the key holdings of the Niels Bohr Library & Archives based on the information presented on the main library page. Specifically, quantify the number of published materials, the linear feet of archival materials, the number of oral histories, and the number of photographs in the visual archives.
Navigate to 'https://www.aip.org/library' Locate the 'Library Collections' section and identify the number of published materials. Locate the 'Archival Collections' section and identify the linear feet of materials and the number of oral histories. Locate the 'Emilio Segrè Visual Archives' information and identify the number of photographs. Synthesize all identified quantities into a concise summary.
Successfully navigate to 'https://www.aip.org/library'. State that the Library Collections hold over 30,000 published materials. State that the Archival Collections include approximately 4,000 linear feet of materials. State that the Archival Collections include nearly 2,000 oral histories. State that the Emilio Segrè Visual Archives contains over 30,000 photographs.