plum crops - [1]
Myrobabalan plum - PFAF shows a red variety.
Zone 3 black ice plum - Fedco with story - [2]
Toka plum - -40F - [3]
Best plums for cold climates - [4]
prunus nigra - Canadian plum - 4a - [5]
a few medium quality plums come true from seed - 1765 - encyclopedia of Diderot - [6]
cold hardy plums! North Dakota extension -[7]
waneta plum! Fedco - 3 - [8]
wild, pure (European, Asian), and prune type plums are likely to come true from seed
fedco plums - [9]
from Canada - zone 4 and 3 European, hybrid, and Japanese plums! - [10]
greengages can be grown from seed - [11]. They see green but deceptively sweet
canadian cold hardy plums - [12]

Links

Minnesota Agriculture station - garden/fruit/stone-fruit-for-minnesota-gardens/#cultivars

Plum