B''H
I went back and was read over this daf, and went and read what the Kollel had to say about this subject, and as I was reading, there was a book by a Rav Issac Herzog. I went on amazon last night, and they didn't have it. So I was wondering if you would know who might have it online, or what Jewish store might carry it in the US?
Nechemyah D, Riverside, CA
Nigel - What you are referring to is Rav Herzog's doctoral thesis, "Ha'techelet b'Yisrael." It has been published in Hebrew (based on the Hebrew version published by Rav Herzog in a Torah journal) in "Ha'Techelet" p.347, by Menachem Burstein (Sifriyati-Gittler 1990, Tel 972-3-562-2392).
The English version was reprinted (with additional information) by Haifa University's Dept. of Oceanology and the Hebrew University's Edelstein Institute.
The PTil Tekhelet society would probably be glad to help you locate any resource related to Techelet.
Good luck!
Mordecai Kornfeld
Kollel Iyun Hadaf