Keywords: Zrs-4.jpg USS Akron ZRS-4 in flight 1931 U S Naval Historical Center Photograph NH 63070 http //www history navy mil/photos/ac-usn22/z-types/zrs4 htm 1931 USN Removed caption read Photo NH 63070 USS Akron in flight 1931 PD-USGov-Military-Navy USS Akron ZRS-4 |