Pham, M. T. N. (2018) “BOOK REVIEW: Halma, R. & Oplinger, C. S. (2001). The Lehigh Valley: A Natural and Environmental History. University Park, PA: The Pennsylvania State University Press. 361 pages. ISBN: 0271020946.”, FIRE: Forum for International Research in Education, 4(1). doi: 10.18275/fire201704011117.