Personen
United States. Agricultural Stabilization and Conservation Service
9
United States. Geological Survey
4
United States. Forest Service. Northern Region
3
Arens, S.M.
2
Maugnard, Alexandre
2
Uhrmacher, Martin
2
Wiersma, J.
2
Arak Photo Studio
1
Assendorp, Dan
1
Boyan, John
1
Calame, Wim
1
Dutchess Community College
1
Reichert, Henry
1
Schaminée, Joop H.J.
1
Sýkora, Karlè V.
1
United States. Army
1
Wells, Edward
1
van der Hagen, Harrie G.J.M.
1
van der Meulen, Frank
1