Author
Jackson, Ronald Vern
222
Sanborn Map Company
153
United States Census Office
141
United States. Bureau of the Census
112
Teeples, Gary Ronald,
111
Potter, Dorothy Williams
79
Pennsylvania Historical and Museum Commission
63
United States. Federal Highway Administration
49
Delaware. Division of Highways. Location and Environmental Studies Office
47
Genealogical Society of Utah
47
United States. National Park Service
47
Frederic R. Kirkland Collection
43
United States Census Office 7th census, 1850
42
Rand McNally and Company
41
Delaware. Bureau of Archaeology and Historic Preservation
40
Historical Society of Pennsylvania
40
Philadelphia City Planning Commission
34
Karl Baedeker (Firm)
33
Mitchell, S. Augustus 1792-1868
32
Ruff, Paul Miller, 1918-
32
Elliott, Bruce S.
30
Pennsylvania Railroad
29
Teeples, Gary Ronald
29
Ontario Genealogical Society
28
Washington, George, 1732-1799
28
Carey, Mathew, 1760-1839
27
Maier, Phyllis C.
27
Pennsylvania. Bureau of Topographic and Geologic Survey
27
Philadelphia Record
27
ADC (Firm)
26
Pennsylvania
26
Schaefermeyer, David,
25
United States Census Office 5th census, 1830
25
Custer, Jay F., 1955-
24
Pennell, Joseph, 1857-1926
24
Page, William, 1861-1934
23
Smith, J. L.
23
United States Census Office 4th census, 1820
23
Institute of Early American History and Culture (Williamsburg, Va.)
22
Maryland State Archives
22
Melish, John, 1771-1822
22
Pre-1801 Imprint Collection (Library of Congress)
20
Tanner, Henry Schenck, 1786-1858
20
United States. Work Projects Administration. Division of Professional and Service Projects
20
Library of Congress
19
Moore, Clarence B. 1852-1936
19
Morse, Jedidiah, 1761-1826
19
United States Census Office 6th census, 1840
19
Daughters of the American Revolution
18
Egle, William Henry, 1830-1901
18
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