Within the mountains there is a sense of timelessness and continuance as change comes but slowly to a people who cherish the old ways. Over hundreds of years of contact the Ifugao have proven themselves doughty fighters, stubbornly resistant to the siren song of progress. More than three centuries have passed since the Spanish first attempted to subdue the Ifugao. The Spanish have long since departed, as has the colonial American administration, but the Ifugao still endure. By adhering to the ways of the ever-present and watchful ancestors, the Ifugao continue to prosper and grow, in spite of the turmoil and chaos that surrounds their world. Resolutely resisting assmilation and change, the Ifugao remain a society of determined and prideful individuals who in the words of Fr. Juan Villaverde, "Have no king, nor ruler, and pay tribute to no one."  The "Ethnographic Atlas of Ifugao" by Harold C. Conklin, published by the Yale University Press in 1980 is an outstanding example of scholarly research, beautifully presented. Although mainly concerned with land use, terracing, crops and agrarian matters, the Atlas also gives an excellent overview of the Ifugao people and their culture. Not sure if it's still in print, but probably available through ethnographic and/or antiquarian booksellers.  For those with more of an interest in material culture, I would recomend "The People and Art of the Philippines," by Father Gabriel Casal, et al. It was published by the Museum of Cultural History at the University of California in Los Angeles in 1981. Although this publication presents more of a general cultural overview of the Philippines, the chapter "Arts and Peoples of the Northern Philippines" by George R. Ellis covers in some detail the mountain people of North Luzon. The text includes an excellent map plus numerous black & white photographs illustrating a rich artistic culture. If you are a really serious kind of person who would like to explore Ifugao ways and customs in some detail, I would recommend "American Archaeology and Ethnology," Volume XV, published by University of California Publications - 1919 - 1922. Reprinted by Kraus Reprint - Periodical Service Co. ; 11 Main St. Germantown; New York, N.Y. 12526 This volume covers different aspects of various mountain groups in great detail. Some great photographs, too.