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  1. 1

    Planning of communication support (information, motivation and education) in sanitation projects and programs od Perrett, Heli

    Wydane 1983
    Książka

    Planning of communication support (information, motivation and education) in sanitation projects and programs
  2. 2

    Social feasibility analysis in low- cost sanitation projects od Perrett, Heli

    Wydane 1983
    Książka

    Social feasibility analysis in low- cost sanitation projects
  3. 3

    Using communication support in projects the World Bank's experience. od Perrett, Heli E.

    Wydane 1982
    Książka

    Using communication support in projects the World Bank's experience.
  4. 4

    Human factors in project work od Perrett, Heli

    Wydane 1980
    Książka

    Human factors in project work
  5. 5

    Human factors in project work od Perrett, Heli

    Wydane 1980
    Książka

    Human factors in project work

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