[Request] Comintern anthem for piano, partially completed

So I want to learn it since its one the few communist songs with a decent Spanish version, plus its usually accompanied by a piano, thing is, I found a sheet for the right-hand notes (forgive me if it has a proper name, I don't know much about musical terminology), but I can't transcribe the left hand from videos, also, I need before two weeks, since im planning on playing it at school, here are a couple of versions (in case the piano is better heard in one) and the sheets I've found:
https://www.youtube.com/watch?v=_d1ffrN0dJE
https://www.youtube.com/watch?v=1TqufpfFMdM
https://www.russian-records.com/details.php?image_id=32937
http://lh6.googleusercontent.com/-PjbRAmVdbp4/TiQr4BlNbEI/AAAAAAAACjA/GQYyW7URDQ8/s800/page-04.jpg
http://www.sovmusic.ru/notes/cominter_01.jpg