Notable Filipino scientist have been contributors in the field of social science in the country. Raul V. Fabella was an academic, economist and scientist that graduated in Seminario Mayor-Recoletos (Bachelor of Philosophy; 1970); the University of the Philippines School of Economics (Master of Arts; 1975); and Yale University (Doctor of Philosophy; 1982). He had written articles in both theoretical and applied fields: political economy and rent-seeking; the theory of teams; regulation; international economics; and mathematical economics and was associated with the concepts of "Olson ratio", in rent-seeking, egalitarian Nash bargaining solutions and debt-adjusted real effective exchange rate. Teodoro Agoncillo, a 20th-century Filipino historian, and received the national scientist award for his contributions in the field of history. He graduated from the University of the Philippines (Bachelor of Philosophy; 1934) and finished his Master of Arts degree in the same university in 1935. He also wrote books regarding the Philippine History like "History of the Filipino People". Encarnacion Alzona, a pioneering Filipino historian, educator and suffragist became the first filipina to obtain a Doctor of Philosophy. She got her degree in history and a master's degree from the University of the Philippines and later obtained another master's degree in history from Radcliffe College in 1920, and a Ph.D. from Columbia University in 1923. She was an advocate of women suffrage in the Philippines and authored the book "The Filipino Woman: Her Social, Economic and Political Status (1565-1933)". that stated a stable account for women despite their lack in political and social rights. Forestry is the field of science that practice planting, managing and taking care of trees. The governing body for the Philippine forestry is the Department of Environment and Natural Resources (DENR). This department started way back in 1863, when the Spanish Royal Decree established the Inspeccion General de Montes. This was transformed into the Department of Interior in 1901. Then when the government reorganized, it became the Department of Agriculture and Natural Resources. During 1987, the Department of Environment and Natural Resources was formally established. Under this department, the Forest Management Bureau was the sector that focuses on preserving the forest and the harvesting of its resources. The Philippines have an actual forest cover at 6.5 million hectares (ha) or 24% of the total land area. A lot of Filipinos rely on these resources for their survival. The country's goal is to have a sustainable forest-based industry that can contribute to the socio-economic development and support the disadvantaged sectors of society.