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The feasibility study on upgrading inter-urban highway system along the Pan-Philippine Highway (Sta. Rita, Plaridel - San Jose Station) final report, main text. ανά Katahira & Engineers International

Master plan study on Luzon island strategic road network development project final report ; main text. July 1993.

Environmental guidelines for infrastructure projects III ; roads. September 1992.

Environmental guidelines for infrastructure projects I ; ports and harbors. September 1992.

Environmental guidelines for infrastructure projects VIII ; groundwater development. September 1992.

Environmental guidelines for infrastructure projects XI ; tourism development. September 1992.

Environmental guidelines for infrastructure projects VII ; sewerage. September 1992.

Environmental guidelines for infrastructure projects IX ; water supply. September 1992.

Environmental guidelines for infrastructure projects XIII ; urban transportation development. September 1992.