All 4 Uses

yield
in
Into the Wild
(Edited)

It may, after all, be the bad habit of creative talents to invest themselves in pathological extremes that yield remarkable insights but no durable way of life for those who cannot translate their psychic wounds into significant art or thought.
p. 70.1 *

yield = produce
I aimed for another spot, and once again it glanced off unyielding diorite with a dull clank.
p. 153.3 *

unyielding = hard

editor's notes: This sense of yielding means "giving way". The prefix un- means not and reverses the meaning as it does in unlikely and unsatisfactory. So something that does not give way is hard.
Puzzled by these questions, and troubled, I am hoping that the rusting hulk of Fairbanks bus 142 will yield some clues.
p. 174.9

yield = produce
An extensive search of the medical and botanical literature yielded not a single indication that any part of H. alpinum is poisonous.
p. 192.9

yielded = produced

Definitions:

(1) (yield as in: will yield valuable data)
to produce (usually something wanted); or the thing or amount produced
(2) (yield as in: yield to pressure)
to give in, give way, or give up
(3) (meaning too rare to warrant focus)