We wish to acknowledge the help and assistance provided by and 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 criticism.
« Conclusion   |   Appendix I »

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