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A SURVEY OF PHOTOGRAPHIC NEGATIVE COLLECTIONS FROM 1925-1950: SOME RESULTS AND OBSERVATIONS 

https://www.ischool.utexas.edu/~cochinea/pdfs/j-jamison-04-survey.pdf

Jamye Jamison Presented at the Association of North American Graduate Programs in Conservation Annual Student Conference, New York City, April 2003; Appears in Topics in Photographic Preservation, Volume 10, 2004 

                                               Th. (Theodor) Paar