No Edition Remarks. 19 pages. This is an ex-Library book. Blue paperback report. Full title: BIOS Final Report No 801 Item No. 9 & 31. German Photo-Engraving Industry, Collodion Emulsion, Cross-Line Screens . Text is typed not printed. Pages are mildly tanned throughout. Text is clear. Binding remains firm. Expected library inserts, stamps and inscriptions. Covers have mild edge-wear with curling to corners. Visible tanning to spine and edges with scuffing to spine ends.