Newton Comics' Planet of the Apes #14 was published 13 December 1974:
The cover is a composite of three separate images from the issue. The main image is from page 51:
The first inset image is from page 68:
The second inset image is from page 66:
The contents are as follows:
Kingdom On An Island Of The Apes [Chapter 4: The Island Out Of Time] originally published in Planet of the Apes #10, July 1975
As detailed in my post on Newton's Planet of the Apes #13, the first page of this chapter was printed on its own, with a TO BE CONTINUED advisory note. It is continued in this issue with a modification to the introductory page:
A title panel has been inserted at the expense of the detail in the original panel from as per Marvel's Planet of the Apes #10 page 23:
I repeat my advice: If you want to read Kingdom On An Island Of The Apes seek out a copy of Newton's Planet of the Apes #NN/.
[Kingdom On An Island Of The Apes] Chapter 5: Battle, originally published in Planet of the Apes #10, July 1975
On Location: Conquest of the Planet of the Apes, originally published in Planet of the Apes #9, June 1975. This is a non-comics feature, and omits two pages of photographs.
Beneath the Planet of the Apes Part VI [V]: The Children Of The Bomb
You will recall that in Newton's Planet of the Apes #13, only the first 5 pages of Beneath the Planet of the Apes Part V: The Children of the Bomb were reprinted, to be continued in this issue. The chapter does continue in this issue, but it omits the 6th page, being page 51 of Planet of the Apes (Marvel) #10:
And begins with a retitled and mistitled Chapter VI:
The original page 57 from Marvel's Planet of the Apes #10 looks like this:
Do I really need to repeat my advice...?
The Hell of Holocaust, originally published in Planet of the Apes #11, August 1975
Finding the Future on the Fox Ranch!, originally published in Planet of the Apes #10, July 1975
The contest in this issue expires 26 January 1976.
As the cover proudly boasts this is the New Giant Size Monthly Edition. This format would prevail for the remainder of the series. However, unfortunately, the monthly frequency would not endure.
This issue was advertised in-house:
This is scanned from The Silver Surfer #4.
PS 12/1/19: Some new information has come my way about the publication date of this issue. As it is related to other issues I will update this post when I've sorted through the new information.