Coast to Coast on Four Motors (页面存档备份,存于互联网档案馆) September 1940 Popular Mechanics History of the Boeing 307 (页面存档备份,存于互联网档案馆) by Boeing Historical Division
contributions to themechanics of engineering polymers and biological materials, with both fundamental and applied impact” Orcutt, Mike. This Football Helmet
Diversity. Popular Mechanics. 2015 [2015-07-16]. (原始内容存档于2015-07-20). Feltman, Rachel. New data reveals that Pluto’s heart is broken. The Washington Post