Vintage Undated "Ballistic Computation" document in a 2-prong report cover. Written by L.S. Dederick, Associate Director Ballistic Research Laboratory at Aberdeen Proving Ground in Maryland. L.S. Dederick worked at Aberdeen Proving Ground during WWII as the chief of the computing lab using 150 human computers and an IBM punch card computer. (Edwin Hubble: Mariner of the nebulae, 1995, Christianson.) Appears to be a typewritten report not meant for publication. Cover and pages have yellowed with ageShipped with USPS Priority Mail.