The white man's great lines of migration across the continent to the western ocean were three: 1) the Oregon trail to the Northwest; 2) the pioneer route west to the Missouri River and over the Rockies to Great Salt Lake; 3) from Leavenworth southwest by the Santa Fe trail to the southern Sierra. Where the oxcart went, Postmaster General Walter Folger Brown has decreed, there shall the commercial airplane first go—until men learn to travel through the air as safely and economically as they can move on earth. Result: migratory lines Nos. 2...

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