Spherical ballooning, some of the requirements (1917)
McCullough, Paul James, 1881- · Saint Louis, The Mangan printing company · leaf 13
Foreword MODERN works on theory and practice in the art of ballooning, not being sufficiently primary to satisfy the average student, this compilation was suggested as a means to assist in an effort to become competent to suc- cessfully assemble and pilot the spherical balloon. Description of…
Balloons
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
