The importance of Java seen from the air : a book devoted to the interests of the island of Java / edited and compiled by H. M. de Vries ; with the co-operation of the Military Air Force, the State Railways, the Municipalities and numerous private concerns ; air-photographs by the Military Air Force ; text by the editor with the assistance of data supplied by the department of Agriculture, Industry and Commerce, the Central Statistical Bureau and the Chambers of Commerce ; translation by H. J. Bridge