Reference Material for Heyn
2 Books Found
 | Air Aces of the 1914 - 1918 War Author(s): Bruce, Heyn, McKay, Houart, Nowarra, Alexander, Lamberton Publisher: Harleyford (1959) |
 | United States Army and Air Force Fighters 1916 - 1961 Author(s): Brown, Heyn, Freeman, Bowyer, Berry Publisher: Harleyford (1961) |