Apologies for cross-posting. I sent this question to the 78-L list also. Dear ARSC: I have a series of 12" records that I would like to date. I believe that they were made in 1913 or 1914. I have matrix numbers, but the manufacturer is not listed on the label. To be most accurate, I think that the numbers below are matrix numbers....the number printed on the label and the number inscribed on the disc match. Etched on the disc, there is an additional number, separated from the other number by a hyphen, which I believe to be the "take", i.e. 16532-1 Is there a discography that would tell me the manufacturer, the age, and hopefully the recording dates, of these discs? Matrix 16532 - 16579 Matrix 16682 - 16685 These are a series of recorded lectures entitled "The Photo-Drama of Creation" Any help would be most appreciated. Sincerely, Eric Hollis