I’ve several times had cause to refer to the Estonian Morphology Guide written by Mati Pentus at Moscow State University.

Things like these are hard finds, so seeing that it’s CC-0, I’m mirroring it unchanged in its entirety here:

• Estonian Morphology Guide
• Gvidlibro pri la morfologio de la estona lingvo
• Эстонский язык: пособие по морфологии (converted to UTF-8)

Aitäh, Mati!