CONTENTS.
A late volcanic eruption in northern California and its peculiar lava, by Joseph Silas Diller.
—— Same. No. 80. Washington, 1891. 279pp..20
CONTENTS.
Correlation papers. Devonian and Carboniferous, by Henry Shaler Williams.
—— Same. No. 81. Washington, 1891. 447pp., 3 pls..25
CONTENTS.
Correlation papers. Cambrian, by Charles Doolittle Wolcott.
—— Same. No. 82. Washington, 1891. 273pp., 3 pls..20
CONTENTS.