Note 37 — I Magic Stones and Electric Gems
Reading edition
See Herbert E. Gregory, “Note on the Shape of Pebbles,” in The American Journal of Science, vol. xxxix, pp. 300–304; March, 1915; also for two succeeding paragraphs.
Reading edition
See Herbert E. Gregory, “Note on the Shape of Pebbles,” in The American Journal of Science, vol. xxxix, pp. 300–304; March, 1915; also for two succeeding paragraphs.