The Chronicle of Higher Education published an article by Jeffrey Herlihy-Mera that speaks to Ernest Hemingway's Cuban Spanish. Check it out via this link:
https://www.chronicle.com/blogs/linguafranca/2018/07/01/clean-well-spoken-hemingways-cuban-spanish/?cid=at&utm_source=at&utm_medium=en&elqTrackId=57bd89151a3e4c9396e5dc25a5c4b32a&elq=6118c2b95e554c309f876043f269d7a3&elqaid=19623&elqat=1&elqCampaignId=9033