This is the November 1952 issue of National Geographic with an article on Marineland.
This is a highly interesting article about Marineland / Marine Studios. Located south of St. Augustine, the groundbreaking facility was the first in the world dedicated to large sea life, especially mammals. National Geographic probably chose to feature the facility in a large article because of its educational focus and the unique ability for movies to be filmed in the state-of-the-art pools. In fact, that’s why it was originally named Marine Studios.
National Geographic always excels in providing details and there are so many in this article. While it’s at least partially a promotional piece for Marineland and should be viewed in that context, it can also stand as an excellent exploration of the facility and its work in 1952.