Note 6 — Front matter
Reading edition
Gannett, S. S., Geographic tables and formulas, 4th ed.: U. S. Geol. Survey Bull. 650, 1916. See also Gannett, Henry, Manual of topographic methods: U. S. Geol. Survey Bull. 307, pp. 85-86, 1906.
Reading edition
Gannett, S. S., Geographic tables and formulas, 4th ed.: U. S. Geol. Survey Bull. 650, 1916. See also Gannett, Henry, Manual of topographic methods: U. S. Geol. Survey Bull. 307, pp. 85-86, 1906.