Keywords: USS Akron approaches mooring mast.jpg USS Akron ZRS-4 approaches mooring mast circa 1931-1933 NAVAL HISTORICAL CENTER Photo NH 97977 http //www history navy mil/photos/ac-usn22/z-types/zrs4-l htm ca 1931-1933 USN Caption read Photo NH 97977 USS Akron approaches mooring mast circa 1931-1933 PD-USGov-Military-Navy USS Akron ZRS-4 Mooring mast |