iron, lead, manganese, gold, copper, natural gas, salt, and sulfur. Transylvania's GDP (nominal) is $194 billion and its GDP per capita measures around $24,500. Transylvania's Human Development Index is ranked 0.890, which makes Transylvania the 2nd most developed region in Romania after Bucharest-Ilfov and makes it comparable to countries like the Czech Republic, Poland and Estonia. There are large iron and steel, chemical, and textile industries. Stock raising, agriculture, wine production and fruit growing are important occupations. Agriculture is widespread in the Transylvanian Plateau, including growing cereals, vegetables, viticulture and breeding cattle, sheep, swine, and poultry. Timber is another valuable resource. IT, electronics and automotive industries are important in urban and university centers like Cluj-Napoca (Robert Bosch GmbH, Emerson Electric), Timișoara (Alcatel-Lucent, Flextronics and Continental AG), Brașov, Sibiu, Oradea and Arad. The cities of Cluj Napoca and Târgu Mureș are connected with a strong medical tradition, and according to the same classifications top performance hospitals exist there. Native brands include: Roman of Brașov (trucks and buses), Azomureș of Târgu Mureș (fertilizers), Terapia of Cluj-Napoca (pharmaceuticals), Banca Transilvania of Cluj-Napoca (finance), Romgaz and Transgaz of Mediaș (natural gas), Jidvei of Alba county (alcoholic beverages), Timișoreana of Timișoara (alcoholic beverages) and others. The Jiu Valley, located in the south of Hunedoara County, has been a major mining area throughout the second half of the 19th century and the 20th century, but many mines were closed down in the years following the collapse of the communist regime, forcing the region to diversify its economy. During the Second World War, Transylvania (the Southern/Romanian half, as the region was divided during the war) was crucial to the Romanian defense industry. Transylvanian factories built until 1945 over 1,000 warplanes and over 1,000 artillery pieces of all types, among others. Culture The culture of Transylvania is complex, due to its varied history and longstanding multiculturalism, having incorporated significant Hungarian (see Hungarians in Romania) and German (see Germans of Romania) influences. With regard to architecture, the Transylvanian Gothic style is preserved to this day in monuments such as the Black Church in Brașov (14th and 15th centuries) and a number of other cathedrals, as well as the Bran Castle in Brașov County (14th century), and the Hunyad Castle in Hunedoara (15th century). Notable writers such as Emil Cioran, Lucian Blaga, George Coșbuc, Ioan Slavici, Octavian Goga, Liviu Rebreanu, Endre Ady, Elie Wiesel, Elek Benedek and Károly Kós were