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References
1.
“Cine-Film Projection ,” by
Hill
Cecil A.
, Fountain Press , London . 1952 .
2.“Choosing A School Projector ,” and “Using A School Projector ,” British Film Institute , London .
3.
“Practical Projection for Teachers ,” by
Atkinson
N. J.
, Current Affairs Ltd. , London , 1948 .