I have an ancestor who was a merchant seaman on the Great Lakes. In 1880 he is not enumerated with his wife & children in Milwaukee, and I have not found him via familysearch.org. Was there any special enumeration of men at sea on census dates? Also, how were American citizens enumerated who were traveling by ship on a census date (i.e., traveling to or from Europe)? Kathleen Craine Chicago KACraine@aol.com