Pennsylvania at Gettysburg. Ceremonies at the dedication of the monuments erected by the commonwealth of Pennsylvania to mark the positions of the Pennsylvania commands engaged in the battle. Pennsylvania. Gettysburg Battle-field Commission. Nicholson, John P. (John Page), b. 1842. text Harrisburg, E. K. Meyers, state printer, 1893. eng 2 v. 26 cm. Paged continuously. Edited and complied by John P. Nicholson, secretary of the commission. Pennsylvania. Militia. Gettysburg, Battle of, Gettysburg, Pa., 1863. United States -- History -- Civil War, 1861-1865 -- Regimental histories.