This set of 6 National Geographic magazines from 1991 includes issues from February, March, June, July, October, and December. Volumes 179 and 180 feature articles on travel, geography, history, nature, and outdoors, with a focus on news and general interest topics. The magazines are illustrated and published in English by the National Geographic Society in the United States. Each unit contains one physical issue, making this set a valuable addition to any magazine collection for those interested in natural history and exploration.