Federal Aviation Administration Aviation Medical Education maybe Series 4 pamphlet. This informational brochure focuses on "Breathing in Flight" and explains the effects of altitude on oxygen levels and pilot physiology. The front panel features bold text and graphics illustrating the concept that "The Higher You Fly The Less Air In The Sky." The interior pages delve into the science behind oxygen requirements, hypoxia, and hyperventilation, including a glossary of terms. The back panel displays the "Office of Aviation Medicine" logo and identification. Sold as is.