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The secondary group in this series is a set of twenty-nine negatives , ten of which are 8.6 x 15.0 cm film pack negatives and nineteen of which are 35mm frames . The Boston Public Library , through its dual department of Microtext / Newspaper Room , collects , maintains , organizes and houses the permanent collections of preservation master negatives and preservation files of original newspapers owned by the Library , as well as those microfilms acquired from other libraries and newspaper publishers .