Παρόμοια τεκμήρια

• Ground water in northwestern Pennsylvania /
  ανά: Leggette, Ralph Maxwell
  Έκδοση: (1936)
• Pennsylvania's regions : a survey of the Commonwealth /
  Έκδοση: (1967)
• 1970 Pennsylvania statistical abstract /
  Έκδοση: (1969)
• Elements of a master plan for higher education for Pennsylvania : a report to the State Board of Education of the Commonwealth of Pennsylvania /
  Έκδοση: (1965)
• Pennsylvania statistical abstract : eleventh annual edition January 1969 /
  Έκδοση: (1969)