I've just discovered that the two-volume set Roster of Maine in the Military Service of the United States and Allies in the World War, 1917-1919 is free to view at the Hathi Trust Digital Library. Summarized service records are offered for Mainers serving in the Army, Navy, Marine Corps, Coast Guard, Army Nurse Corps and Navy Nurse Corps, as well as for Yeomen (F)—women serving in the U.S. Naval Reserve.
These are the same records included in the Ancestry.com collection "Maine Military Men, 1917-1918."
This is a great book. Thank you so much for the info.
Has anyone any information on 1st Gas Regiment (More commonly known as "The Hellfire Boys") 30th Engineer Battalion USArny for 1917. My dad was injured with Mustard gas at or about Flanders field. I have a coy of his injury report filed by his comander and his medals (5 battles) including a purple heart. I am interested in finding more information on his outfit. Thanks.