Author
Pennsylvania Supreme Court Eastern District
5
Pennsylvania Schuylkill Valley Railroad Company,
4
Rudolph, Sebastian A.
3
Stinson, Charles H.
3
Devonshire, Easton
2
Jenne, Lyle L.
2
Pennsylvania
2
Robert J. & John V. McNally (Philadelphia)
2
Wilmington Fountain Society (Wilmington, Del.)
2
YA Pamphlet Collection (Library of Congress)
2
American Association for the Advancement of Science
1
American Society of Civil Engineers. Philadelphia Section
1
Atlee, Washington L. 1808-1878
1
Banik, Gerhard
1
Barker, George F. 1835-1910
1
Boston (Mass.) Water Commissioners
1
Boye, Martin H. 1812-1909
1
Bridge, James Howard, 1858-1939
1
Britton, Katherine
1
Brückle, Irene
1
Brydon, Norman F.
1
Bureau of Municipal Research (Philadelphia, Pa.)
1
Cavendish, Henry, 1731-1810
1
Cresson, Charles M.
1
Cresson, Charles M. 1828-1893
1
Daniels, Vincent
1
Darlington, William, 1782-1863
1
De Kinder, J. J. b. 1845
1
Eltonhead, William B.
1
Engineers Club of Philadelphia
1
Fairmount Water Works Interpretive Center (Philadelphia, Pa.)
1
Foster, Margaret Dorothy, 1895-
1
Hall, George Martin, 1891-1941
1
Hazen, Allen, 1869-1930
1
Hollingsworth, Samuel S.
1
Howard, Charles Spaulding, 1896-
1
Ingenhousz, Jan, 1730-1799
1
Interstate Commission on the Delaware River Basin Conference
1
Khazan, Olga
1
Leeds, Albert R.
1
Lewis, John Frederick, 1860-1932
1
Lohman, S. W. 1907-1992
1
Lohr, E. W. 1897-
1
Ludlow, William, 1843-1901
1
McFadden, W. H.
1
Mears, John W. 1825-1881
1
Neeson, John Henry
1
Owens, Owen D.
1
Pennsylvania College. Medical Department
1
Pennsylvania Geological Survey
1
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