As far as the Boston library's offerings for newspapers, they have almost every single Massachusetts newspaper (daily & weekly). I've focused my research on just the time frame with the Disney Treasury strip. The Boston Advertiser had all 5 Disney strips, like the other Hearst papers (Mickey Mouse, Donald Duck, Scamp, Uncle Remus, and the Disney Treasury), up until 1965, when they dropped Scamp and the Disney Treasury, in the middle of 'The Monkey's Uncle'. They dropped Uncle Remus in late 1969. When the Boston Advertiser merged with the Herald, they brought Mickey Mouse and Donald Duck with them. Donald Duck was dropped at some point in 1975, and Mickey Mouse was dropped at some point in 1976. When the Herald-Advertiser became the Herald American, they did get one other Disney strip in 1978, Winnie the Pooh. It ended being dropped the following year (I believe it was replaced by Drabble).
The Middlesex News had started their Sunday comics with 2 Disney ones (the Disney Treasury, and Scamp) in 1970. Both were dropped in 1972 and reinstated in 1973. They added Donald Duck to their lineup in 1975. They also added Mickey Mouse to the lineup in 1976.
The Lowell Sun had the Disney Treasury starting in 1965 and ending in 1987.
The Worcester Telegram had no Disney comics.
The Springfield Republican had Mickey Mouse and Donald Duck in the 1960s. I'm not sure for how long, but I do know they were gone by 1971. They also had the Winnie the Pooh strip for a short time.
The Standard-Times (New Bedford) had Scamp, and they also had Winnie the Pooh for a short time.
The other Massachusetts dailies from cities like Brockton, Fall River, Attleboro, didn't have Sunday comic sections before 1980.
The library also had non-Massachusetts papers like the Hartford Courant (which featured Uncle Remus until 1965; and the Disney Treasury until 1969, when it was dropped after 'Hang Your Hat on the Wind'); The NY Daily News; The Providence Journal (which, again, had a short run for the Winnie the Pooh comic); The Burlington Free Press; San Francisco Chronicle; Los Angeles Times; Honolulu Star-Bulletin; Chicago Tribune (only the 1973 papers had Donald Duck); Washington Post (the only Disney comic featured in this paper was Donald Duck); The New Hampshire Union Leader
That's all I really know from browsing hundreds of microfilm.