Hi, What is your Guido's given name. Your Baba's given name, Maiden name?
If you are searching for family in Ukraine - these names may be helpful.
Did the memoirs - mention names of your Grandparents parents in Ukraine ?
There are Message Boards - Mail lists - that you can post to -for Ukraine -
Alberta GenWeb - Local History book site - online
shows many MELNYK families - perhaps your family submitted family history/story to the Local History Book Project
http://www.rootsweb.ancestry.com/~canab/lhb/alberta-lhb-McKi...What is your source of info re Rivna [Rivno] near Kalush?
Do a Google search for both -