Isn't this also the one with the lizard man character?How does this 1980 supplement fit in? The preamble on the cover seems to suggest a certain methodology was assumed and prevailed:
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No longer will you the Dungeon Master need to spend precious time laboring over the task of generating non player characters. This valuable booklet contains hundreds of non player characters of all races and types, complete with alignments, sex, personalities and much more.
The race, sex, alignment, six ability scores, hit points, AC, attack bonus, damage bonus, dexterity bonus, save bonuses, reaction attacking adjustments during surprise, and a sketch of the magic item palette are provided for each character. They appear to be consistent with the PHB method.
EDIT: Why does a Goblin have the same hit points as a bandit, but +1 to hit. Why does a sergeant have the same hp as a man-at-arms, but +1 to hit; and the same chance to hit as the Goblin, though having hp comparable to a Hobgoblin who has +2 to hit compared to the Goblin?
These differences are arbitrary ones. They're not modelling anything. There's no reason, in the fiction, why there are no humans with the same hp and to hit profiles as Goblins or Hobgoblins.