recordings on disks and records of all formats, including piano rolls, reels and spools, and 8-track tapes) the Canadian Postal Archives; national newspapers from across Canada, including daily newspapers, student newspapers, Indigenous magazines, and ethnic community newsletters. Notable items in the collection include: the Proclamation of Canada's Constitution Act, 1982, which bears marks left by raindrops during a ceremony on Parliament Hill in April 1982 when Queen Elizabeth II signed it; a copy of the Constitution Act, 1867 (aka the British North America Act), which features editing changes made by the first Prime Minister of Canada, Sir John A. Macdonald; De antiquitate Judaica: De bello Judaico ('Antiquities of the Jews and the Judean War')—the oldest book in the collection—written by 1st-century historian Flavius Josephus and printed in 1470; the chair used by world-renowned pianist Glenn Gould while he played and recorded. Digitization The LAC also houses more than a petabyte of digital content. Some of this content is available online, primarily books, Canadian theses, and census material—equating to around 5 thousand terabytes of information in electronic format. Many items have not been digitized and are only available in physical form. As of May 2013, only about 1% of the collection had been digitized, representing "about 25 million of the more popular and most fragile items." Operations Since its inception, LAC has reported to Parliament through the Minister of Canadian Heritage. LAC's stated mandate is: to preserve the documentary heritage of Canada for the benefit of present and future generations; to be a source of enduring knowledge accessible to all, contributing to the cultural, social and economic advancement of Canada as a free and democratic society; to facilitate in Canada co-operation among communities involved in the acquisition, preservation and diffusion of knowledge; to serve as the continuing memory of the Government of Canada and its institutions. LAC is expected to maintain "effective recordkeeping practices that ensure transparency and accountability". Management The Librarian and Archivist of Canada has the same seniority level as a deputy minister of a federal department. On May 27, 2019, Leslie Weir was appointed Librarian and Archivist of Canada for a four-year term commencing August 30, 2019. Weir is the first woman to hold this role. The head of Canada's national archives was known as the Dominion Archivist from 1872 to 1987 and the National Archivist from 1987 to 2004. See also List of archives in Canada Notes