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＜図書＞
An evaluation of continuous consumer panels as a source of marketing information / {by} Harper W. Boyd Jr. and Ralph L. Westfall.
(Marketing research techniques ; series A)

出版者	Chicago : American Marketing Association
出版年	c1960.
大きさ	20 p. 23 cm.
著者標目	Boyd, Harper W. Westfall, Ralph L.
件　名	Consumer panels

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