deicing area
81Protection of exposed concrete — is necessary to prolong its service life. A 120 year design life for concrete infrastructure has become increasingly common. Without early preventive maintenance this design life target may be optimistic. The design service life of reinforced… …
82Pinus nigra — European Black Pine Pinus nigra Pinus nigra subsp. nigra, Bulgaria Conservation status …
83Douglas C-47 Skytrain — C 47 redirects here. For other uses, see C47 (disambiguation). C 47 Skytrain C 53 Skytrooper Role Military transport aircraft …
84Douglas C-124 Globemaster II — C 124 Globemaster II Role Heavy lift military transport aircraft Manufacturer Douglas Aircraft Company …
85NASA spin-off — Science and technology in the United States African American contributions Discoveries …
