The Ninth World Energy Conference: the economic and environmental challenges of future energy requirements
Ninth World Energy Conference : the economic and environmental challenges of future energy requirement. population and energy resources / Ninth World Energy Conference
Ninth World Energy Conference: the economic and environmental challenges of future energy requirements: environment and the energy supply / Ninth World Energy Conference
Ninth World Energy Conference: the economic and environmental challenges of future energy requirements: energy resource recovery / Ninth World Energy Conference
Ninth World Energy Conference: the economic and environmental challenges of future energy requirements: energy conversion / Ninth World Energy Conference
Ninth World Energy Conference: the economic and environmental challenges of future energy requirements: transportation of energy / Ninth World Energy Conference
Ninth World Energy Conference: the economic and environmental challenges of future energy requirements: utilization of energy / Ninth World Energy Conference
Present Possibilities of Studying Foundations of Concrete Dams (Mem.nº 457) / Manuel Rocha
Produções, exportações e importações de substâncias minerais de Portugal Continental e Ilhas Adjacentes em 1972 / Fernando A.C. Macieira
Produções, exportações e importações de substâncias minerais de Portugal Continental e Ilhas Adjacentes em 1971 / Fernando A. C. Gonçalves Macieira
O sector energético metropolitano : combustíveis / Direcção Geral dos Combustíveis
Oil and world power : a geographical interpretation / Peter R. Odell