@#%^ing love you, Wint. Every time you post, I love you more.
Some if not most of those areas have had mobs replaced with higher levels though, so some areas might not be viable anymore, meanwhile 70s through 80s will have tons of new targets.
hmmmmmmm..... based on my memory of those changes...
Valkurm Dunes 10-20 (still viable, just have to be wary of the goblin bounty hunters)
Qufim Island 20-25 (still viable)
Yuhtunga Jungle 25-28 (still viable)
Yhoator Jungle 28-32 (still viable)
Garliage Citadel -or- Eastern Altepa Desert 32-37 (both still viable)
Crawler's Nest 35-52 (35-40 is still viable, at least
Western Altepa Desert 40-45 (still viable)
Quicksand Caves 45-52 (still viable, unless my memory is incorrect)
Kuftal Tunnel 50-55 (still viable)
Labyrinth of Onzozo 55-62 (still viable, if incredibly horrible because toramas @#%^ing suck)
Ro'Maeve 62-75 (I've no idea)
Bibiki Bay 62-75 (somewhat viable, 62-67ish at least. I did have a pretty bitchin' party here around 77-79, before abyssea exp because commonly known, though.)
Sky 70-75 (I've got no idea, because I can't really remember where exactly the camps started, and I don't know how much, if any, of the weapons camps got borked up)
Dunno, most of them still work, from my experience, since I use the now vacant camps as solo-grounds for slightly higher jobs (especially eastern altep. @#%^ing love me some spider pages, they're so squishy, and they're @#%^ing everywhere, you can grind here from 35-45 pretty damn easy)