This is an article that came through my e-mail, and I thought it was interesting.
http://www.newenglandhistoricalsociety.com/the-shot-heard-round-the-world-concord-vs-lexington-vs-menotomy/?utm_source=NEHS+ACTIVES&utm_campaign=19b29760f7-EMAIL_CAMPAIGN_2019_04_25_09_39&utm_medium=email&utm_term=0_66a9ef2b02-19b29760f7-158977457
In addition, they reference a book from 1825 (about 40 pages, I think) about the event:
History of the Battle of Lexington: On the Morning of the 19th April, 1775
https://play.google.com/store/books/details?id=jFlHAQAAMAAJ&rdid=book-jFlHAQAAMAAJ&rdot=1
I wasn't sure which section to put this in, so figured I would start with Maine.
:-)