Muster roll for Company A, Washington Light Infantry District, 1861 April 10

The collection is primarily focused on Williams' membership in the Washington Light Infantry, his published and unpublished works on proper performance of various military duties, and his work for the Coast Survey. The collection contains a work log from his days at the Coast Survey, correspondence received by Williams, and his published and unpublished works, including one which was written over part of a daily log from his service in the D.C. Militia Infantry.