Hi Shel, Newspaper supplements could be around 133 lpi halftone printing screen, multiply by "quality factor" of 1.5 (normal) or even 2 (best, but usually used for coated paper stock zines), that's around 200 ppi, 8x10". You can perhaps use more generous ppi as if it's an editorial photo, newpaper photoeditors like to crop a lot ;-)
Frantisek
