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Key West

Hemingway and Pauline went to Kansas City, Missouri, where their son Patrick was born on June 28, 1928, at Bell Memorial Hospital. Pauline had a difficult delivery; Hemingway wrote a fictionalized version of the event in A Farewell to Arms. After Patrick's birth, they traveled to Wyoming, Massachusetts, and New York. On December 6, Hemingway was in New York visiting Bumby, about to board a train to Florida, when he received the news that his father Clarence had killed himself. Hemingway was devastated, having earlier written to his father telling him not to worry about financial difficulties; the letter arrived minutes after the suicide. He realized how Hadley must have felt after her own father's suicide in 1903, and said, "I'll probably go the same way."

Upon his return to Key West in December, Hemingway worked on the draft of A Farewell to Arms before leaving for France in January. He had finished it the previous August but delayed the revision. The serialization in Scribner's Magazine was scheduled to appear in May. In April, he was still working on the ending, which he may have rewritten as many as seventeen times. The completed novel was published on September 27, 1929. Biographer James Mellow believes A Farewell to Arms established Hemingway's stature as a major American writer and displayed a level of complexity not apparent in The Sun Also Rises. In Spain in mid-1929, Hemingway researched his next work, Death in the Afternoon. He wanted to write a comprehensive treatise on bullfighting, explaining the toreros and corridas complete with glossaries and appendices, because he believed bullfighting was "of great tragic interest, being literally of life and death."

During the early 1930s, Hemingway spent his winters in Key West and summers in Wyoming, where he found "the most beautiful country he had seen in the American West" and hunted deer, elk, and grizzly bear. He was joined there by Dos Passos. In November 1930, after taking Dos Passos to the train station in Billings, Montana, Hemingway broke his arm in a car accident. He was hospitalized for seven weeks, with Pauline tending to him. The nerves in his writing hand took as long as a year to heal, during which time he suffered intense pain.

His third child, Gloria Hemingway, was born a year later on November 12, 1931, in Kansas City as "Gregory Hancock Hemingway". Pauline's uncle bought the couple a house in Key West with a carriage house, the second floor of which was converted into a writing studio. He invited friends—including Waldo Peirce, Dos Passos, and Max Perkins —to join him on fishing trips and on an all-male expedition to the Dry Tortugas. He continued to travel to Europe and to Cuba, and—although in 1933 he wrote of Key West, "We have a fine house here, and kids are all well"—Mellow believes he "was plainly restless".

In 1933, Hemingway and Pauline went on safari to Kenya. The 10-week trip provided material for Green Hills of Africa, as well as for the short stories " The Snows of Kilimanjaro " and " The Short Happy Life of Francis Macomber ". The couple visited Mombasa, Nairobi, and Machakos in Kenya; then moved on to Tanganyika Territory, where they hunted in the Serengeti, around Lake Manyara, and west and southeast of present-day Tarangire National Park. Their guide was the noted "white hunter" Philip Percival who had guided Theodore Roosevelt on his 1909 safari. During these travels, Hemingway contracted amoebic dysentery that caused a prolapsed intestine, and he was evacuated by plane to Nairobi, an experience reflected in "The Snows of Kilimanjaro". On Hemingway's return to Key West in early 1934, he began work on Green Hills of Africa, which he published in 1935 to mixed reviews.

He purchased a boat in 1934, naming it the Pilar, and began to sail the Caribbean. He arrived at Bimini in 1935, where he spent a considerable amount of time. During this period he worked on To Have and Have Not, published in 1937 while he was in Spain, which became the only novel he wrote during the 1930s.