Expense Tray Photography Photographic Emulsion Thiosulphate 


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Copyright information

© Derick Unwin and Ray McAleese 1978

Authors and Affiliations

  • Derick Unwin
    • 1
  • Ray McAleese
    • 2
  1. 1.Educational Research & Development UnitQueensland Institute of TechnologyBrisbaneAustralia
  2. 2.Department of EducationUniversity of AberdeenAberdeenScotland

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