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How to develop successful salesmen
Kenneth B. Haas
Bok Engelsk 1957
Preparation and use of visual aids
by Kenneth B. Haas and Harry Q. Packer ; ...
Bok Engelsk 1951
Preparation and use of visual aids : with completely new material and sources of supply
by Kenneth B. Haas and Harry Q. Packer ; ...
Bok Bokmål 1946