Under the Yoke will be a disappointment.
But do check Vazov's poems in "Epopee to the Forgotten". There are some good ones, the translations are decent, and what better way to learn some Bulgarian by going verse by verse with the original and the translation.

Everything can be found online. Here's an example:
http://www.slovo.bg/showwork.php3?AuID=283&amp;WorkID=10654&amp;Level=2