CHARLES D. WALCOTT, DIRECTOR REGULATIONS OF THE UNITED STATES GEOLOGICAL SURVEY THIRD EDITION 'PPROVED DECEMBER 27, 1902, TO TAKE EFFECT WASHINGTON GOVERNMENT PRINTING OFFICE 1903. |
CHARLES D. WALCOTT, DIRECTOR REGULATIONS OF THE UNITED STATES GEOLOGICAL SURVEY THIRD EDITION 'PPROVED DECEMBER 27, 1902, TO TAKE EFFECT WASHINGTON GOVERNMENT PRINTING OFFICE 1903. |