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Uncommon "radio reference map," showing the ten inspection districts of the US Bureau of Navigation as well as time zones and other features of importance to amateur radio operators.

The map was made for Leo Meyerson, founder of World Radio Laboratories and referred to on the map by his call sing "W0GFQ." 

The World Radio Laboratories was founded by Meyerson following a $1,000 loan from his father. WRL was one of the earliest manufacturers of amateur radio equipment.

Rumsey 9787.