From 1839 to 1842, he served with the corps of engineers that was employed by the Commonwealth of Pennsylvania in the survey and construction of public improvements.[5]
After completed law studies, Packer was admitted to the bar on August 6, 1844, and began his legal practice in Sunbury, where he was also engaged in banking.[6]
^"Packer, John Black" (biography), in Biographical Directory of the United States Congress. Washington, D.C.: Office of the House Historian and Office of the Senate Historian, U.S. Congress, retrieved online January 14, 2023.
^Kestenbaum, Lawrence. "Packer, John Black" (biography).Ann Arbor, Michigan: The Political Graveyard, 1996.
^Kestenbaum, Lawrence. "Packer, John Black" (biography), The Political Graveyard, 1996.
^"Packer, John Black" (biography), in Biographical Directory of the United States Congress.
^"Packer, John Black" (biography), in Biographical Directory of the United States Congress.
^"Packer, John Black" (biography), in Biographical Directory of the United States Congress.
^"Packer, John Black" (biography), in Biographical Directory of the United States Congress.
^"Packer, John Black" (biography), in Biographical Directory of the United States Congress.
^Kestenbaum, Lawrence. "Packer, John Black" (biography), The Political Graveyard, 1996.
^"Packer, John Black" (biography), in Biographical Directory of the United States Congress.
^"Packer, John Black" (biography), in Biographical Directory of the United States Congress.
^Kestenbaum, Lawrence. "Packer, John Black" (biography), The Political Graveyard, 1996.
