Sea Glass
Maria V. Snyder
Glass (2)
Наука и жизнь #11-12 1943
Nauka i Zhizn Magazine
Техника - молодежи №02 1948
Tekhnika Molodezhi Magazine
Крокодил, 1927 , № 21
Krokodil Magazine
We Don’t Plummet Out of the Sky Anymore
M. David Blake