3-5. 1941. airway meteorological atlas for the United States.
"A Quantitative Study of the Nocturnal Migration of Birds. Vol.3 No.2"
George H. Lowery.
By writing to the authorities in these localities, Mr. Giddings also secured much valuable information for them as to present weather conditions and landing-fields-information which was further supplemented by numerous special airway maps supplied by the Aero Club of America and similar aviation organizations in foreign countries.
"Around the World in Ten Days"
Chelsea Curtis Fraser
The process is somewhat similar to the experience in large r airway stations.
"Dry-Farming"
John A. Widtsoe