Hello! I have the verse and poet and dedicatee etc, think I know what’s going on with the undefineds. However, I must have gone wrong somewhere with my crossings in 23d for which I now have -ASTIID-. Would be thankful for some advice :)
I think you have the wrong spelling of the city, Eider. You need the pre-1991 Soviet one. Dropping the last letter of a three-letter word for to resolve inside the code for Latvia