National Research Council (US)
National Research Council (U.S.). Transportation Research Board
Robert D. Krebs
Unknown Author
National Research Council (U.S.) Transportation Research Board
Donald Snethen
National Research Council (U.S.). Highway Research Board.
T. Rwebangira
Geo-Congress 98 (1998 Boston, Mass.)
Robert G. Lukas
National Lime Association
E. B. McDonald
Brazil. Divisão de Pesquisa Pedológica
Portland Cement Association