{PDF} A student’s atlas of flowering plants : some dicotyledons of eastern North America planned and prepared under the direction of Carroll E. Wood, Jr., assisted by Elizabeth A. Shaw ; with the technical help of Karen S. Velmure and Kenneth R. Robertson.

{PDF} Lightning Parameters for Engineering Applications (CIGRE Technical Brochure 549) V.A. Rakov, A. Borghetti, C. Bouquegneau, W.A. Chisholm, V. Cooray, K. Cummins, G. Diendorfer, F. Heidler, A. Hussein, M. Ishii, C.A. Nucci, A. Piantini, O. Pinto, Jr., X. Qie, F. Rachidi, M.M.F. Saba, T. Shindo, W. Schulz, R. Thottappillil, S. Visacro, W. Zischank