ਭੁਕਾਨਾ: ਰੀਵਿਜ਼ਨਾਂ ਵਿਚ ਫ਼ਰਕ

"[[Reader's Digest]]: Stories Behind Everyday Things"; New York: Reader's Digest, 1980.

 

{{ਕਾਮਨਜ਼ ਸ਼੍ਰੇਣੀ|Balloons|ਭੁਕਾਨਿਆਂ}}

*[http://stratocat.com.ar/indexe.html Stratospheric balloons, history and present] Historical recompilation project on the use of stratospheric balloons in the scientific research, the military field and the aerospace activity