You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: PUBLISHING 
Clue: Founded in 1856, this company introduced a numbering system for U.S. highways in 1917
rand mcnally

Category: ACTORS & THEIR FILMS 
Clue: The title of Richard Burton's last feature film, or the year it was released
1984

Category: MAMMALS 
Clue: One type of this aquatic animal gives milk that's 65% fat; pups are weaned in 4 days, the least of any mammal

the seal