I'd recommend listening to the following as well as Bob Marley & the Wailers.
The Wailers albums Catch A Fire, Burnin'.
Bunny Wailer - Blackheart Man, Struggle
Peter Tosh Legalize it, Equal Rights, Mystic Man, Bush Doctor.
Burning Spear - Especially the Marcus Garvey and Hail HIM albums.
Toots & The Maytals,
Third World - 96 degrees in the shade.
Any albums by Ijaman Levi,
Lee Scratch Perry
Keith Hudson,
Big Youth,
Early Aswad before they became more commercial,
Matumbi,
Steel Pulse (Handsworth Revolution) first.
Ras Michael & the Sons of Negus.
Sly & Robbie.
There's enough to start you off there.