United States. Army. Corps of Engineers & ProQuest (Firm). (1844). Magnetic observatory, at the Girard College, Philadelphia. Ordinary meteorological observations, from July to December, 1842. [publisher not identified].
Chicago Style (17th ed.) CitationUnited States. Army. Corps of Engineers and ProQuest (Firm). Magnetic Observatory, at the Girard College, Philadelphia. Ordinary Meteorological Observations, from July to December, 1842. Washington: [publisher not identified], 1844.
MLA (9th ed.) CitationUnited States. Army. Corps of Engineers and ProQuest (Firm). Magnetic Observatory, at the Girard College, Philadelphia. Ordinary Meteorological Observations, from July to December, 1842. [publisher not identified], 1844.
Warning: These citations may not always be 100% accurate.