Progress of seismological investigations in the United States : January 1, 1925, to June 30, 1927 (Report to the Section of Seismology of the International Geodetic and Geophysical Union, International Research Council) / by N.H. Heck, Division of terrestial magnetism and seismology.
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| Format: | Government Document Book |
| Language: | English |
| Published: |
Washington, D.C. :
Govt. Print. Off,
1927-30.
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| Series: | Special publication (U.S. Coast and Geodetic Survey) ;
no. 132. |
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