A sudden turn in the plot of my life makes me study Estonian urgently.
Just in case you also have the same necessity one day: three Russian-language books on the theoretical grammar of the Estonian language.
Yes, the 1955 one still has those kolkhozes and subbotniks, but go over the morphological section only.
English titles:
A. ValmetEstonian language
E. Päll Estonian language
M. Pentus Estonian language
Original titles (Russian):
А. Валмет “Учебник эстонского языка”
Э. Пялль “Учебник эстонского языка”
М. Пентус “Эстонский язык”
First published in the Levinarium Telegram Channel (now closed and deleted)