Comunidad de Regantes de Nules.
Willem Franciscus Antonius Heemskerk
Metropolitan North Georgia Water Planning District.
A. Driesprong
Unknown Author
Christiane Weller
J. C. N. Raadschelders
H. J. M. Havekes
Irving Howards
John Ross Marshall
Werner Hoppe
United States. Soil Conservation Service
Frederik Willem Conrad
United States. Congress. House. Committee on Resources. Subcommittee on Water and Power Resources
Rand McNally
Texas Natural Resource Conservation Commission. Water Planning and Assessment Division.
Aldo Ramadoro
United States. Congress. House