North American Fruit Explorers mailing list at ibiblio

[Rodney Eveland <Reveland@WYOMING.com>]

All we have ever been able to grow has been sour cherries and now I am
happy that they have developed zone 4 sweet cherries on a hardy dwarfing
rootstock that is adaptable to a wide range of soils.

http://www.raintreenursery.com/catalog/producttype.cfm?producttype=CHER

The price seems to be a little higher than for other varieties.

Here is Cornells's press release on this cherry.

http://www.nysaes.cornell.edu/pubs/press/current/2cherries02.html