1. Kodak A1157 Reference (shelfmark): Kodak A1157 Title: Scope & Content: Correspondence from F. W. Krohn, c.1898, to de Lancy regarding Hurter and Driffield's photometer and tests; letters to John Sterry 1898, one enclosing sample test step negatives. Research; Krohn Collection Area: Visual Arts Languages: English Date Range: 1898 Extent: 1 folder: Manuscript; negatives