Nancy Bramucci Sheads, Resurrecting Mount Auburn (http://mountauburn.msa.maryland.gov/detail.cfm?pid=3923 : accessed 15 July 2014) entry for Peter Purviance.
Peter Purviance was born into slavery in Baltimore, Maryland. On 17 March 1864, he was sold for $250 by Francis B. Lawrenson to Joseph J. Gambrill. The following day Purviance was mustered into Company K of the 30th U.S.C.T. at Birney Barracks, resulting in his manumission. On 14 April 1864, Gambrill received $300 compensation under the provisions of General Orders, No. 329, 1863. Purviance remained with the 30th U.S.C.T. until 17 August 1865, when he transferred to the U.S. Navy.
Resurrecting Mount Auburn 