Authors: H.
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- Helmholtz, Hermann von 1821-1894 370 downloads
- Shelton, F. H. - 369 downloads
- Greenfield, Taylor H. - 369 downloads
- Schroeder, Albert H. - 369 downloads
- Sommer, H. B. - 368 downloads
- H. G. B. - 367 downloads
- Self, H. I. M. - 367 downloads
- Umbstaetter, H. D. (Herman Daniel) 1851-1913 367 downloads
- Pollock, Horatio M. (Horatio Milo) 1868-1950 367 downloads
- Moon, James H. 1830- 366 downloads
- Kinealy, J. H. (John Henry) 1864-1928 366 downloads
- Nichols, H. L. - 366 downloads
- Stoke, Melis 1892-1942 365 downloads
- Huygens, Constantijn 1596-1687 365 downloads
- Fairbanks, Charles H. (Charles Herron) 1913-1985 364 downloads
- Sluijters, Hendrik 1807-1859 364 downloads
- Holstein, Anna M. (Anna Morris) 1824-1900 364 downloads
- Cleaveland, Elizabeth H. Jocelyn (Elizabeth Hannah Jocelyn) 1824-1911 364 downloads
- De Loach, R. J. H. (Robert John Henderson) 1873-1964 364 downloads
- Logeman, H. (Henri) 1862-1936 363 downloads
- Roberts, Randal H. (Randal Howland), Sir 1837-1899 363 downloads
- Nelson, H. William (Hector William) 1869- 363 downloads
- Ryus, W. H. (William Henry) 1839- 363 downloads
- Hoare, E. H. (Edward Hatch) 1790-1873 363 downloads
- Paull, H. B., Mrs. 1812-1888 363 downloads