Man in the Funny Hat
Hero
Of everything listed the 1E DMG is indispensible. And I disagree that you won't get use out of it at the table as I think that many of the tables at least can still have practical use. But you mentioned a desire for seeing the game from a historical perspective. Again, for that it is INDISPENSIBLE. It is, all at the same time, revelatory for both how the game was played, and how it was NOT played. The fact that some things are there demonstrates that they were considered more important then whereas today they may be ignored - and the fact that some OTHER things are there demonstrates only that the better DM's knew better than the rules EVER WILL what was sensible and desireable to include in THEIR game and what wasn't. And the best part is YOU still get to decide what falls into which category.