Development of a digital model of ground-water flow in deeply weathered crystalline rock, Chester County, Pennsylvania /

"August 1980."

Effects of strip mining the abandoned deep Anna S Mine on the hydrology of Babb Creek, Tioga County, Pennsylvania /

Bibliography: p. 41.

The policy of extending government aid to additional railroads to the Pacific by guaranteeing interest on their bonds : report of the majority of the Senate Committee on Pacific Railroad, February 19, 1869.

Cover title.

The great railroad conspiracy : the social history of a railroad war.

Mode of access: Internet.

Experimental design for evaluating the safety benefits of railroad advance warning signs /

Mode of access: Internet.

Criteria for abandoned mine reclamation : regional planning to develop project guidelines in the Blacklick Creek watershed, Pennsylvania /

Includes bibliographical references.

Our Campbell ancestors, 1742-1937. Traditions and history of the family of five Campbell brothers and sisters; John, James Douglas, Hester, Mary and Samuel: including what is known of them in New Jersey; York county, Pennsylvania; Union county, South Carolina and in Ohio. A genealogy of the known descendants of John Campbell through his son James, and Samuel Campbell through his son Ralph, also brief ancestral notes on families connected by marriage with the foregoing; viz; Parnell, Clark, Spray, Wilson, Haskett, Mendenhall and Underhill,

Bibliographical foot-notes.

Delaware River watershed: New York, Pennsylvania, New Jersey, Delaware and Maryland. Program for run-off and waterflow retardation and soil erosion prevention.

Report includes appendices, survey report.

Proceedings for Integrated Pest Management Colloquium, October 17-18, 1978, Grey Towers, Milford, Pennsylvania /

Includes bibliographical references.

Cold storage lockers in Pennsylvania ...

Reproduced from typewritten copy.

Soil survey of Montour County, Pennsylvania /

Item 102-B-38

"Motor trips" ... New England and Canada [pt. 1]; New York, Pennsylvania--New Jersey, Florida [pt. 2]

Mode of access: Internet.

Study of consumer expenditures, incomes, and savings; statistical tables: Urban U. S.--1950, tabulated by the Bureau of Labor Statistics, U. S. Dept. of Labor, for the Wharton School of Finance and Commerce, University of Pennsylvania.

Mode of access: Internet.

The Register of Pennsylvania /

Title from caption.

The Amish people; seventeenth-century tradition in modern America; a complete, illustrated story of the "Old Order" sect of southeastern Pennsylvania.

Mode of access: Internet.