If you're looking for a free PDF specifically, I recommend checking if any reputable educational or literary websites have made excerpts or the full text available for academic purposes or as part of a promotion. Remember, accessing copyrighted material without permission can have legal consequences and also deprives the creator of their deserved income.
: Some libraries and educational institutions have copies of "Dekada '70" in their collections. You might be able to borrow a copy or access it digitally through their subscriptions. Dekada 70 Lualhati Bautista Pdf Free Download