Thanks HD, that's the best one of those on-line ash ID pages yet... nice pictures. I'm confident now that all the trees I've identified as ash in my woodlot are of the White Ash species. Although the link you provided has me wondering about some (unidentified trees) I have growing in a low wet area on the north-west side. It has a small water-way running through it during spring/early summer, and on a wet year it will run all summer. I don't spend much time down in there because most of the trees are small(ish) and undergrowth is thick... but, your link has me wondering about black and/or green ash as a candidate, especially the picture of shaggy bark on the Black Ash.
Funny how old dogs can learn new tricks... I never even considered ash as good firewood until I joined AS, so I've never paid much attention to it. I've now also learned that all those trees I've glanced at over the years in woodlots, yards, parks and wherever, muttering, "yep, that's an ash tree" have probably all been White Ash... and I may have actually misidentified some Green and Black Ash along river bottoms as walnut?? by using a quick glance at bark and
canopy in passing.