help with Aramaic?

[Joan C Biella]

Friends, I'm cataloging a book with a title that I don't understand.  It seems 
it must be either

Agra de-ta'anita
or, maybe, 
Igra de-ta'anita

Can you tell me which?  If "agra," is this the "agra" that means "meretorious 
deed"?  Or what??  Perhaps needless to say, the book is a commentary on 
Masekhet Ta'anit.

Thank you--
Joan

P.S.  The author is Nahum Avraham of Monsey, N.Y.--publication date, 767.