Camp David in 1935 and was completed in 1938. In 1942, President Franklin D. Roosevelt converted it to a presidential retreat and renamed it "Shangri-La" (for the fictional Himalayan paradise in the 1933 novel "Lost Horizon" by British author James Hilton, which he had jokingly referenced as the source of the Doolittle Raid earlier that year). Camp David received its present name from Dwight D. Eisenhower, in honor of his father and grandson, both named David. The Catoctin Mountain Park does not indicate the location of Camp David on park maps due to privacy and security concerns, although it can be seen
Lost Horizon called the first American paperback book, when in fact paperbacks had been around since the mid-1800s. What made Pocket Book #1 of revolutionary importance was that it was the first "mass-market" paperback; mass market paperbacks allowed people of modest means not only to own books they otherwise could not afford but also to slip the paperback into their pocket for casual reading on the go, hence the name "Pocket Book". By the 1960s, Pocket Books alone, over the course of more than 40 printings, had sold several million copies of "Lost Horizon", helping to make it one of the most