I only have a 'Best Of' too. And 'Rose O Cimmaron' doesn't have the dynamic range I've heard elsewhere. I like 'Staring At The Sky'.
Never got the 12". Wasn't in when delivered and went back to the sorting office. And I forgot about it, and left it too late for it to be redelivered. Should have gone back to sender, but they say it hasn't arrived yet.
"Can I have a flake in that and some monkey's blood please - mista."
Blue and Gray is listed in Wikipedia as Poco's rarest album. I think I found it in Tower Records many years ago (on vinyl). It's not on Spotify, but here is the title track on YouTube. A superb album, really worth hunting down.
There are quite a few "twofer" CDs of Poco at Amazon, including Under The Gun/Blue & Gray from just over seven quid new. One copy of the Blue & Gray vinyl in stock at £22.08 new or £11.00 "Used - Like New "
I didn't used to need the internet, my wife knew everything.