00350nam a22001217a 4500 230620b xxu||||| |||| 00| 0 eng d 309.2 NRC National research Council US Science and Technology for Development A contribution to the 1979 U.N Conference Vienna 1979 212p ddc BK 1514 1514 0 0 ddc 0 0 002 002 2023-06-20 0 309.2 NRC 10001887 2023-06-20 2023-06-20 BK