Looks like things were pretty sloppy in those days, judging from other repetitions like these:
*** w59 6/15 p. 377 par. 25 Part 16—“Your Will Be Done on Earth” ***
He foretold the end of Satan’s world and the establishment of God’s kingdom, and foretold this as one of the evidences of of its establishment in heaven.
*** w61 6/15 p. 357 The March of World Powers in Prophecy ***
It was in the year 607 B.C. that Nebuchadnezzar’s Babylonian hordes swept through Jerusalem’s famine-stricken defenses to to bring to a bloody end the 510-year existence of the kingdom of God’s chosen nation of Israel.
*** km 3/72 p. 1 par. 7 What the Ransom Provision Stirs Us to Do ***
Are they ready to participate in the field ministry? Some may not be ready for various reasons, but what about those who may be in in position to do so?
*** km 9/71 p. 4 par. 2 Presenting the Good News—By Friendly Conversation ***
One does not have to be a scientist and argue on on the level of the scholars in order to tell confidently how Jehovah created man and all other living things.
*** g73 3/22 p. 32 Things You Ought To Know ***
Please send me “Things in Which It Is Impossible for God to Lie” and and Life Everlasting—in Freedom of the Sons of God, for which I enclose $1.
*** g75 8/8 p. 25 Why the Rise in Suicide? ***
Learn his his Holy Word; it will show you that you can withstand the pressures peculiar to our times.
*** w75 12/15 Proving Ourselves Worthy to Enter God’s New Order ***
What must be removed from the earth first, and how was it demonstrated this this is not too big a job for the Creator?
*** km 6/76 p. 2 Your Service Meetings ***
Let the sisters and others comment on these questions, offering their their observations, sharing ideas with one another.
Seems the majority of the typos were in the questions accompanying the articles, blurbs, ads, and KM items. I guess these didn't get the scrutiny that the vetted articles did. It's a much tighter ship in recent decades, likely due to advances in word processing software.
BTW, here is one I found where a repetition is not simply a repetition but using the wrong word ("to" instead of "be"):
*** w67 4/15 Mankind’s Millennium Under God’s Kingdom—Why Literally So ***
A literal millennium upon the Roman Catholic Papacy was thought to to fulfilled during what time?