It is always necessary to close a lecture on geology with humility.
Annual Report of the Board of Regents of the Smithsonian Institution, 1924, The Drifting of the Continents (p. 236), Government Printing Office. Washington, D.C. 1925
It is always necessary to close a lecture on geology with humility.
Annual Report of the Board of Regents of the Smithsonian Institution, 1924, The Drifting of the Continents (p. 236), Government Printing Office. Washington, D.C. 1925
