Northern Region of Nigeria (Nigeria). Public Works Dept. Annual report on the Public works Department of the Northern Region of Nigeria. Govt. Printer.
Citace podle Chicago (17th ed.)Northern Region of Nigeria (Nigeria). Public Works Dept. Annual Report on the Public Works Department of the Northern Region of Nigeria. Kaduna: Govt. Printer.
Citace podle MLA (8th ed.)Northern Region of Nigeria (Nigeria). Public Works Dept. Annual Report on the Public Works Department of the Northern Region of Nigeria. Govt. Printer.
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