Harvard University, Society of the Cincinnati, and Boston Public Library. He engraved the Philadelphia Centennial Exhibition award medal (1876) which was struck in the Philadelphia Mint. In 1891, Mitchell was invited by the Secretary of the Treasury to join a committee to evaluate the artistic design proposals for a new issue of U.S. coins. The two other members were Charles E. Barber, Chief Engraver of the United States Mint, and Augustus Saint-Gaudens. In addition to being considered an expert on heraldry, Mitchell was regarded as one of the best engravers and medal designers in the United States. A state coat of arms provided an opportunity to convey the natural and industrial resources available to its residents. Common themes depicted in state arms include farming, industry, transportation (e.g., boats, trains, and wagons), and nature (e.g., sunsets and mountains). The Ohio and Indiana state arms depict fairly substantial mountains in the distance. In reality, the highest points in Ohio and Indiana are Campbell Hill () and Hoosier Hill () respectively. When State Arms of the Union was published in 1876, some existing arms were not included (e.g., Arizona and Washington Territory). At the time, Alaska was classified as the Department of Alaska (1867–84) and became the District of Alaska (1884–1912) before becoming the Territory of Alaska (1912–59). The Alaska territorial seal was designed in 1910 and adopted in 1913. On 3 January 1959 Alaska became the 49th U.S. State. The Oklahoma Territory (1890–1907) Organic Act was approved on 2 May 1890, and a territorial seal was adopted on 10 January 1893. Hawaii, formerly the Kingdom of Hawaii (1795–1893), Republic of Hawaii (1894–98), and then Territory of Hawaii (1898–1959) became the 50th U.S. State on 21 August 1959. None of the territories or states mentioned above had a coat of arms represented on national currency. Authorization The design of a state coat of arms or seal has generally been authorized by a provision in the state constitution or a legislative act. In most instances a committee (more often than not consisting of three members) was appointed to study the issue, seek advice from qualified artists, historians, legal scholars, etc., and report back to the authorizing legislative body with a design for their approval. Historically, this committee has consisted of notable members of society and elected officials. The first committee to design the Great Seal of the United States was appointed on 4 July