Tom Swift in the City of Gold

"Letter for you, Tom Swift." "Ah, thanks, Mr. Wilson. This is the first mail I've had this week. You've been neglecting me," and the young inventor took the missive which the Shopton postman handed to him over the gate, against which Tom was leaning one fine, warm Spring day. "Well, I get around as often as I can, Tom. You're not home a great deal, you know. When you're not off in your sky racer seeing how much you can beat the birds, you're either hunting elephants in Africa, or diving down under the ocean, or out in a diamond mine, or some such out-of-the-way place as that. No wonder you don't get many letters. But that one looks as if it had come quite a distance.