During his time as a POW (1920-21) in the Polish-Soviet War, Merian C. Cooper, wrote an autobiography: Things Men Die For by "C". He turned the manuscript over to Dagmar Matson to type for publisher submission. It was submitted to G. P. Putnam's Sons in New York (the Knickerbocker Press) in 1927 and published that same year. Just after the book's release, he changed his mind about releasing the personal details about "Nina" and asked Dagmar to buy up every copy she could find. She managed to acquire most of the 5,000 copies that had been released. Cooper kept a copy and Dagmar kept a copy, while the rest were eventually destroyed. Dagmar sent Nina money every month, on behalf of Cooper, until his death.

• Merian Caldwell Cooper (October 24, 1893 — April 21, 1973) was an American aviator, United States Air Force and Polish Air Force officer, adventurer, screenwriter, and film director and producer. His most famous film was the 1933 movie King Kong.