Ecology, environment, and sustainable development : reflections spanning five decades / Sajise, Percy E., Southeast Asian Regional Centre for Graduate Study and Research in Agriculture. University of the Philippines at Los Baņos. SEA SAJ 2012 C336 Or. College, Los Baņos, Laguna, Philippines : Southeast Asian Regional Center for Graduate Study and Research in Agriculture : University of the Philippines Los Baņos, c2012. c2012. Text x, 151 p. :