Note 1 — I Magic Stones and Electric Gems
Reading edition
Rosenfeld, “Singing and Speaking Stones”; Scientific American Suppl. No. 1720, p. 395, Dec. 19, 1908.
Reading edition
Rosenfeld, “Singing and Speaking Stones”; Scientific American Suppl. No. 1720, p. 395, Dec. 19, 1908.