Mississippi
Tom Stelma described the differences in his book as:
Arkansas - has a pointed nose, the grooves are of a normal type, and the base possesses a deep ellipsoidal cavity with an irregular, eccentric rim.
Port Hudson - possesses a fuller upper body with a more founded nose, normal grooves, and a deep ellipsoidal cavity with a concentric rim.
Jenkins Ferry - has a tall upper body with a pointed nose and normal grooves, but the cavity has a conical truncated flat-tip design, with a sprue mark below the nose showing it is side cast.
South Texas Musketoon (I don't recall ever seeing one) - is cast and has a fuller upper body with a flat nose and normal grooves, but with a thin wall Lovell type cavity.
Tom's description of the musketoons is probably as good as I have read.
Hope that helps.