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Subjects: (Alexander Dallas),; (Julius Erasmus),; 1797-1878; 1806-1867; 1807-1873; 1809-1884; 1812-1875; 1825-1891; Agassiz, Louis,; Bache, A. D; Correspondence; Engelmann, George,; Geomagnetism; Henry, Joseph,; Hilgard, J. E; Letters; Magnetic declination; Mexico; National Academy of Sciences (U.S.); Observations; United States; United States and Mexican Boundary Survey; United States Coast Survey; Wilson, Henry,</div>
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Hilgard, J. E.</div>
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