roughly 375 military maps and plans that were prepared by the Board of Ordnance in the 18th century for government troops during the Jacobite period. Within the collection are maps of routes, fortifications, and Highland towns. The items in the collections were donated to the library in the 1930s by a government department descended from the Board. Stevenson collection The Stevenson Collection is a holding of 19th and 20th century manuscript and printed maps, drawings, and building plans from the Stevenson family, a Scottish engineering family who specialised in building lighthouses, harbours, and other civil engineering works. The collection mostly covers their work in the United Kingdom, although there are some works concerning Japan and New Zealand, as well as several other countries. Acquisitions related to the theatre The National Library of Scotland holds materials related to (primarily) Scottish theatre, though many of the individual notable items are found across different collections. It has a wide range of theatre materials, including scripts and manuscripts, business papers, sets, theatre programmes, and photographs. 20th and 21st century theatre Many of the theatre-related items from the 20th and 21st century are held by the Library. These include plays and unpublished manuscripts; music hall and pantomime material; posters, playbills and programmes; reviews and news cuttings; theatre company archives; and material from the Edinburgh Fringe Festival. The general public are able (and encouraged) to view these items at the Special Collections Reading Room in the library's main building, a space where people can consult rare books, manuscripts, and music. Theatre of the 20th century is also well represented on film and can be viewed by the public at the library's Moving Image Archive. The Set of The Cheviot, the Stag, and the Black, Black Oil The Cheviot, the Stag, and the Black, Black Oil is a Scottish play by playwright John McGrath. The play tells the history of economic change and exploitation in the Scottish Highlands, from the Highland Clearances all the way through to the contemporary oil boom at the time of its initial production. The stage set for the play, designed and painted by Scottish artist John Byrne, was made in 1973 and is in the form of a giant-sized pop-up book. The Library acquired the set in 2009, although it is currently on loan to V&A Dundee and is on display at the museum until 2043 as part of a 25-year loan