A deep dive into academic repositories and Uzbek publishing houses reveals a curious absence of a definitive "Rahmatov" grammar textbook. While "Rahmatov" is a common Central Asian surname, there is no widely recognized, canonized English grammar book authored by a figure of that name dominating the legitimate market.
: Several repositories host Rahmatov's grammar materials in PDF format. You can try accessing them via Google Drive Link 1 Google Drive Link 2 Rahmatov Ingliz Tili Grammatikasi Pdf Skachat