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Revelation 8:12-13
12 And the fourth angel sounded, and the third part of the sun was smitten, and the third part of the moon, and the third part of the stars; so as the third part of them was darkened, and the day shone not for a third part of it, and the night likewise.

13 And I beheld, and heard an angel flying through the midst of heaven, saying with a loud voice, Woe, woe, woe, to the inhabiters of the earth by reason of the other voices of the trumpet of the three angels, which are yet to sound!
KJV

Angel should be Eagle Rev. 8:13

According to our Strong's concordance (comparative concordance) the word "angel" here was changed for unknown reason from "eagle".

Re 8:13*eagell
for an angel

We used a Strong's concordance with a comparative concordance. The Strong's with the comparative concordance is out of print, if you want to acquire a copy you will have to search for used copies and hope to find one. We have a copy as recent as the early 1970's that contains a comparative concordance.

The specific publication that we used to extract this information about angel/eagle is as follows:

Strong's Exhaustive Concordance of the Bible
Abingdon-Cokesbury Press
New York • Nashville
Twenty first printing 1953