Philippines. Department of Public Works, Transportation and Communications. Planning and Project Development Office. PPDO geographical coding scheme. [s.n.
Citace podle Chicago (17th ed.)Philippines. Department of Public Works, Transportation and Communications. Planning and Project Development Office. PPDO Geographical Coding Scheme. Manila: [s.n.
Citace podle MLA (9th ed.)Philippines. Department of Public Works, Transportation and Communications. Planning and Project Development Office. PPDO Geographical Coding Scheme. [s.n.
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