I hired Victor Englebert (he lived in Colombia at the time) and arranged for him to be flown in CIAT's King Air to the Colombian Lllanos, near Venezuela.
I directed him to make interesting photos of the environment featuring interesting subjects (especially people) that would be connected to agriculture. I used these photos with captions I wrote and got them to Bill Allen. This resulted in a cover story on germplasm in the NG.
You will find Victor Englebert, his photos and his life, even to this day, extremely fascinating. What a bio! His website has more than 100K 35MM photos!
Google his name and enjoy the links!!!!!
National Geographic chose Lynn Johnson as the photographer.