premise: Florence MacLeod Harper was a Canadian journalist sent by U.S. newspaper "Frank Leslie's Illustrated Newspaper" as a staff reporter with an assignment to cover World War I on the Eastern front. She was an early female war correspondent and one of a handful of western journalists to leave a first-hand journalistic account of the early stages of the Russian revolution.
hypothesis: Harper's account of the early stages of the Russian revolution is the only account of that revolution we have. 
reason: The context says, "one of a handful of western journalists to leave a first-hand journalistic account of the early stages of the Russian revolution." so her account wasn't the only one. 