00274nam a22001097a 4500003000400000008004100004082002000045100001700065245004600082260002800128300000800156OSt230613b        |||||||| |||| 00| 0 eng d  a333.913bEXT290  aEdward, A.L.  aTechniques of Altitude seale Construction  aV., FefferbDelhic1969  a256