Ahern, Tom USA
Andersen, Henning. Denmark
Anderson, Alan J. B. Scotland 
Anderson, Alan and Shirley. USA 
Barlup, Jim. USA 
Barnard, Robert. USA 
Beaudry, Norman. USA 
Berg, Warren. USA 
Berg, Warren. USA  Additionals
Beutler, Eugenie. USA 
Blee, Alistair J. New Zealand 
Blumhardt, O. New Zealand 
Boland, Todd. USA 
Brack, Werner. USA = zone 7
Brack, Werner. USA  Additionals
Bruso, Joe. USA  = zone 5B
Cavender, Richard : (Red's Rhodies). USA 
Chernut, Jim. USA
Chernut, Jim. USA
Bruce Clyburn, Canada
Colombel, Marc. France
Peter Cox, Scotland
Cordy, Earl W. USA
Doi, Yasuyuki, Japan
Doppel, John. USA 
Eiberg, Hans. Denmark
Emerson, Gordon. USA
Emmerich, Bob. USA
Farbarik, John. USA 
Fujioka, Frank. USA 
Furman, Bob. USA 
Gehnrich, Bud. USA = zone 7
Gilkey, Russell. USA 
Glassman, Allan. USA 
Gray, George. USA
Grinevicius, A. Canada 
Tommy Johansson, Sweden
Gross, Dr. Kenneth W. USA = zone 5
Hartman, Rosemary D. USA 
Harvey, Joe. Canada 
Helm, Henry R, USA 
Higgerson, Clyde W. USA
Higgerson, Clyde W. USA Additionals
Horner, Tom. USA 
Ishida, Shin' ichi. Japan
Jenkins, Ewin B. USA = zone 5
Jensen, Peder Hjorth. Denmark 
Jensen, Peder Hjorth. Denmark  Additionals
Clive Justice, Canada
Tommy Johansson, Sweden
Kline, Howard R. USA 
Larus, Charles. USA 
Leijdens, M. The Netherlands
Hirokazu Maehara, Japan
McCullough, Mike. USA
Meltzer, Hanns Germany
Tom Milner, USA
Erhard Moser, Germany
Ohazama, Hideaki. Japan 
Oleri, Mary, USA  
Oliver, Michael R. USA 
Pflug, Gene and Margaret. USA
Jack O'Shannassy, Australia
Pohlandt, DR. Frank. Germany 
Przypek, Walter. USA 
Purdy, David. USA 
Ronald Rabideau, USA 
Rhododendron Species Foundation, USA 
Rhododendron Species Foundation, Seeds from last year
Ring, Dr. Tom. USA 
Roberts, Howard H. USA 
Rosenthal, Jacob. USA = zone 7
Schaarup, Palle. Denmark
Henry Schannen, USA
Henry Schannen, USA additional
Shanni, Kenneth. Canada
Sinclair, June. USA
Sinclair, June. USA Additionals
Southerland, Stan. USA 
Staune, Claus J. Denmark 
Stein Torben. Denmark
Stewart, Francis E. USA
Stilwell,Mike. USA
Thomas, D. USA
Vestergaard, Per Houbak. Denmark 
Voitk, Kaarel. Sweden 
Wallace, Don S. USA
Watson, Elsie. USA 
Weagle, John. Canada 
Weinz, Barbara D. USA 
Jack F. Wilson, Australia
Yasenchak, Ronald. USA 
Yoshimura, Eizi. Japan (JRS Seed Exchange).
Zimmermann, Robert. USA