George Frederick Kunz,
The Book of the Pearl
“ The most recently developed pearl fisheries are within the limits of the United States, in the rivers and fresh-water lakes, and especially those in the Mississippi Valley. As an important industrial enterprise, these fisheries are less than two decades old, yet they are very productive, yielding annually above half a million dollars’ worth of pearls, many of which compare favorably in quality with those from oriental seas. ”
