This 16-page brochure has two Bruce Bomberger paintings on the cover plus 19 color and seven black-and-white photos inside. Both the paintings and many of the photos are familiar from other advertising.
For example, the Bomberger illustration on the right was also used in the March, 1952 National Geographic ad shown below. Notice that the illustration in the ad is cropped very differently; the original painting must include detail in the corners that is missing from both illustrations.
The only ads I can find that use the illustration on the left side of the brochure cover are half-page ads. These were used as early as 1951, but the one below is from 1954, probably from Life, Look, or the Saturday Evening Post.