There is a website with the unit history of the 8th Evac here:
http://www.med-dept.com/unit_histories/8_evac_hosp.php#italy
Enrico, the info on this site might give you more places you can search artifacts.
According to this history, the 8th arrived at Pietramala, 13 October 1944, and left there on 25-29 April 1945.
From the History of the 337th ECB, Major Rowell tranfered from the 185th ECB to the 337th on 23 April, 1945. That was just a couple of days before the 8th left Pietramala, will have to some more cross-checking to find the locations of the battalions around that time.
Thank you for your reply, I knew the website is fantastic!
In Italy on April 25 is the feast of liberation, this date coincides with the end of war in Italy!
The description dell'8th EVAC says that in the third week of November was activated a winterizing program realized by enlisted personnel of the hospital, and engineer. The Major could still be there in November?