We wish to acknowledge the help and assistance provided by
whose valuable merchandise was unavailable for
sale for a considerable period, and for the administrative work involved in
shipping and collating information. Without their help and involvement we could
not have performed this survey.
We are also grateful to Mr. P. Yantzer, the Director of AGSL, Mr. B. Boyajian,
the President of GIA, and Mr. M. Gershburg, the Director of EGL USA, for their
help in verifying the data presented in this article and constructive


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