Chapman, Allen: Fenn Masterson's Discovery. v1. 13 Sep 2014
 

Chapman, Allen: pseudonym of the Stratemeyer Syndicate the producer of a number of mystery series for children, including Nancy Drew, the Hardy Boys, the various Tom Swift series, the Bobbsey Twins, the Rover Boys, and others.

Excerpt
“Oh, I intend to make a fine collection of minerals,”declared Fenn. “I’ll not get tired of that. You see minerals are easy to get. All you have to do is to pick up stones as you walk along. You put them in your pockets and, when you get home, you look in the catalog, see what kind they are, so as to label ’em, and put ’em in one of the little numbered squares of the cabinet. Why, collecting minerals is fun. Besides, it’s valuable information. I might discover—”